Mercedes Sprinter SL103 Driver-Side Rear Quarter Window Installation Guide

Step-by-step Mercedes-Benz Sprinter SL103 installation guide covering SL103-AW, SL103-CA, SL103-F, and SL103-DS driver-side rear quarter windows.

What Is the Mercedes Sprinter SL103 Window Position?

The SL103 window position is the driver side rear quarter of the Mercedes-Benz Sprinter van.

This is the large rear-side body section behind the driver side middle area and ahead of the rear cargo door.

Mercedes Sprinter SL103 Fitment

Current Van Windows Direct product listings show the following fitment:

• Vehicle: Mercedes-Benz Sprinter Van
• Model Years: 2007–2026
• Position: Driver Side Rear Quarter
• Roof Height: Low Roof or High Roof

SL103-AW, SL103-F, and SL103-DS are listed for the 170" wheelbase.

SL103-CA is listed for both 170" and 170EXT Sprinter applications.

The common overall size across the current SL103 products is approximately 1290 mm x 768 mm, or roughly 50.79" x 30.24".

Available SL103 Window Models

SL103-AW Premium Awning Window

The SL103-AW is the premium awning option for the driver side rear quarter.

It features an outward-opening awning panel, built-in retractable insect screen, integrated privacy shade, and solar privacy tempered glass.

Shop SL103-AW Premium Awning Window

SL103-CA Crank-Out Awning Window

The SL103-CA uses a crank-out awning design for controlled ventilation.

Current specifications list an opening size of approximately 859 mm x 423 mm and an outward opening of up to approximately 76 mm (3").

Shop SL103-CA Crank-Out Awning Window

SL103-F Fixed Glass Window

The SL103-F is the fixed-glass version of the driver side rear-quarter window.

It provides a clean OE-style appearance with solar privacy tempered safety glass and no moving window mechanism.

Shop SL103-F Fixed Glass Window

SL103-DS Double-Sliding Window

The SL103-DS provides double sliding ventilation.

The front panel, rear panel, or both can be opened to control airflow. The current design also includes an integrated retractable bug screen and privacy shade.

Shop SL103-DS Double-Sliding Window

Tools and Materials Needed

• One-handed reciprocating saw, pneumatic air saw, or compact body saw
• Thin-metal automotive cutting blade
• Metal file or deburring tool
• Safety glasses
• Work gloves
• Vacuum
• Clean shop cloth
• Automotive primer or suitable urethane primer
• Trim-Lok edge molding
• Automotive glass urethane
• High-ratio urethane gun
• Window-support or masking tape

Mercedes Sprinter SL103 Rear Quarter Cutout Overview

The illustrated red line identifies the approximate inner sheet-metal section that must be removed from the Sprinter driver side rear-quarter panel.

Use the factory stamping as the primary visual reference and compare it with the actual SL103 window before making any permanent cut.

After cutting, the exposed opening should be:

1. Filed smooth
2. Deburred
3. Protected against corrosion
4. Finished with Trim-Lok edge molding
5. Cleaned thoroughly
6. Dry-fit with the actual SL103 window before urethane is applied

Step-by-Step Mercedes Sprinter SL103 Window Installation

Step 1 — Verify the Driver Side Rear Quarter Position

Confirm that you are working on the driver side rear quarter of the Sprinter.

Before cutting, inspect the inside of the van for:

• Wiring
• Insulation
• Factory brackets
• Rear A/C equipment
• Interior wall systems
• Aftermarket accessories

Step 2 — Identify the Inner Sheet Metal to Remove

Use the factory stamped rear-quarter pocket and illustrated guide to identify the inner sheet-metal area requiring removal.

Confirm the intended opening with the actual SL103 window before making the first cut.

Step 3 — Cut From Inside the Van When Possible

Whenever practical, perform the cutting operation from inside the Sprinter.

Working from the interior gives better visibility of the stamped structure and helps reduce the chance of damaging the exterior painted body surface.

Suitable cutting tools include:

• One-handed reciprocating saw
• Pneumatic air saw
• Compact automotive body saw

Use a blade intended for thin automotive sheet metal and work slowly.

Step 4 — Remove the Cut Sheet-Metal Section

Once the required perimeter is fully cut, carefully remove the unwanted sheet-metal section.

Inspect the opening for:

• Remaining metal tabs
• Sharp points
• Raised sheet metal
• Saw burrs
• Irregular cut areas

Step 5 — File and Deburr the Opening

Use a hand file or deburring tool around the complete cut perimeter.

Remove any sharp areas, raised edges, burrs, or high spots.

The finished edge should be smooth enough that it does not interfere with the window, urethane bond, or edge molding.

Step 6 — Protect the Freshly Cut Steel

Freshly exposed automotive sheet metal should not remain unprotected.

Apply an appropriate corrosion-protection coating to the raw edge.

Suitable options may include:

• Automotive rattle-can primer
• Automotive touch-up primer
• Urethane-compatible primer when appropriate

Follow the primer manufacturer's specified flash or dry time.

Install Trim-Lok Edge Molding

Once the opening has been cut, smoothed, and protected, install Trim-Lok edge molding over the finished sheet-metal edge.

Trim-Lok helps:

• Cover sharp sheet-metal edges
• Protect the cut perimeter
• Improve the interior appearance
• Conceal small cutting irregularities
• Create a cleaner finished installation

Trim Reference: Use a close-up crop of the Trim-Lok installation so only the finished edge detail is shown. This avoids confusing the trim example with a different window shape.

Step 7 — Clean the Rear Quarter Body Cavity

Vacuum the opening and surrounding body cavity thoroughly after cutting.

Metal shavings left behind can eventually rust and should be removed before final installation.

Step 8 — Dry-Fit the SL103 Window

Before applying urethane, position the actual SL103-AW, SL103-CA, SL103-F, or SL103-DS into the prepared opening.

Inspect the complete perimeter for clearance.

The window should sit naturally in the rear-quarter position without contacting unintended inner sheet metal.

If interference exists:

1. Remove the window
2. Identify the contact point
3. Carefully adjust the opening
4. File the new cut
5. Re-prime exposed steel
6. Reinstall edge molding where needed
7. Dry-fit again

Urethane-Bonded SL103 Installation

The current SL103-AW, SL103-CA, SL103-F, and SL103-DS windows all use urethane-bonded installation.

Prepare the glass and body bonding surfaces according to the requirements of the automotive urethane system being used.

This normally includes:

• Cleaning the vehicle bonding surface
• Cleaning the glass bonding surface
• Applying required body primer
• Applying glass primer where specified
• Allowing the proper primer flash time

Apply a continuous automotive urethane bead around the required bonding perimeter.

Avoid gaps, thin areas, or inconsistent bead height.

Step 9 — Set the SL103 Window

Carefully position the SL103 window into the prepared driver-side rear-quarter opening.

Apply even pressure around the perimeter so the urethane makes consistent contact.

Tape or support the window during the cure period according to the urethane manufacturer's instructions.

Do not drive the vehicle until the urethane has reached the manufacturer's specified safe-drive-away time.

Common Mercedes Sprinter SL103 Installation Mistakes

Assuming Every SL103 Model Has Identical Fitment

Verify the exact product before ordering or cutting. Current SL103-AW, SL103-F, and SL103-DS listings specify 170" wheelbase, while SL103-CA is also listed for 170EXT applications.

Cutting Too Much Sheet Metal

Remove only the material required for proper clearance. It is easier to refine the opening after a dry fit than to repair an oversized cut.

Skipping the Dry Fit

Always test the actual window before applying automotive urethane.

Leaving Sharp or Raised Metal

File and deburr the complete cut perimeter before installing Trim-Lok.

Leaving Bare Steel Exposed

Freshly cut steel should receive suitable automotive corrosion protection.

Leaving Metal Shavings Inside the Wall

Vacuum the body cavity thoroughly after cutting.

Using Household Adhesive

SL103 windows are designed for automotive glass urethane installation.

Shop Mercedes Sprinter SL103 Driver Side Rear Quarter Windows

Frequently Asked Questions

What position is SL103?

SL103 is the driver side rear quarter window position on the Mercedes-Benz Sprinter.

What Sprinter years do SL103 windows fit?

Current Van Windows Direct listings cover 2007–2026 Mercedes-Benz Sprinter vans.

What wheelbase fits SL103-AW, SL103-F, and SL103-DS?

These current product listings specify the 170" wheelbase.

Does SL103-CA fit the Sprinter 170EXT?

Yes. The current SL103-CA product page lists compatibility with 170" and 170EXT Sprinter vans.

What size are SL103 windows?

The current SL103 models are approximately 1290 mm x 768 mm, or approximately 50.79" x 30.24" overall.

Should the window be dry-fitted before urethane installation?

Yes. Always verify complete clearance and positioning before applying automotive urethane.

Should freshly cut steel be primed?

Yes. Freshly exposed steel should receive suitable automotive corrosion protection.

Should Trim-Lok edge molding be used?

Trim-Lok helps cover and protect the finished sheet-metal edge while creating a cleaner interior appearance.

What adhesive is used for SL103 windows?

Current SL103 models use a urethane-bonded installation with suitable automotive glass urethane.

Final Mercedes Sprinter SL103 Installation Notes

A proper SL103 installation requires more than simply cutting the Sprinter rear-quarter panel and installing glass.

Carefully verify the exact product, prepare the opening, file and protect the exposed metal, install Trim-Lok edge molding, clean the body cavity, dry-fit the actual window, and follow the automotive urethane manufacturer's bonding and cure instructions.

Whether you choose the SL103-AW, SL103-CA, SL103-F, or SL103-DS, always verify the actual van and exact window before making permanent modifications.