The Original Sunroof Gap Filler Kit for BMW

Form&Function Design developed this gap filler solution after identifying the widespread sunroof seal shrinkage issue affecting BMW X-series vehicles. Beta tested with the BMW community and refined based on real-world feedback, this kit has earned a 100% satisfaction rating from BMW owners.

The factory-installed seal contracts over time, creating gaps that allow water and debris into the drain system. Left unaddressed, clogged drains can cause significant water damage to interior electronics—repairs that often cost thousands of dollars. This issue is documented in BMW Technical Service Bulletin MC-10205090-9999.

Why This Kit

• Developed and refined through beta testing with the BMW community
  
• Available as full kit or separate front/side components
• Designed and manufactured in Canada
• From the makers of the original Volvo sunroof gap filler kit (3,000+ sold)

A Permanent Solution

Replacing the factory seal does not solve the underlying problem. Replacement seals are made from the same material and will shrink again over time, making them a recurring expense rather than a permanent fix.

This kit eliminates the need for repeated seal replacements. As the seal continues to shrink, larger inserts from the kit can be installed to maintain protection. The result is a long-term solution that adapts to ongoing seal degradation.

Benefits

• Prevents debris and dust from entering the sunroof drain system
• Reduces water ingress into the drain channels
• Eliminates wind noise caused by the gap
• Restores a clean, factory appearance

Kit Options

The kit is available in three configurations:

• BMWKIT1 — Full Kit (front + side inserts)
• BMWKIT1F — Front Kit only
• BMWKIT1S — Side Kit only

Measure your gap to determine the best size. The "Normal" gap size version fits most vehicles unless the seal has experienced abnormal shrinkage.

Normal Gap Size Kit

Large Gap Size Kit

*Custom lengths available—contact us for more information.

Installation

Installation takes 5–10 minutes with minimal tools required.

Front Kit Installation Video: Watch Video

Side Kit Installation Video: Watch Video

Avoid removing the seal from the sunroof as it may be difficult to reinstall correctly. Follow these steps instead:

1. Select the correct size insert—slightly longer is better
2. Push the seal back along the track with your fingers (silicone lubricant helps)
3. Insert the gap filler onto the glass using a plastic trim tool
4. Pull the seal back over the insert until flush

Compatibility

This kit fits the following models:

• 2018–Present — BMW X3 (G01)
• 2019–Present — BMW X4 (G02)
• 2019–Present — BMW X5 (G05)
• 2020–Present — BMW X6 (G06)
• 2019–Present — BMW X7 (G07)
• 2019–Present — BMW X3 M (F97)
• 2019–Present — BMW X4 M (F98)
• 2020–Present — BMW X5 M (F95)
• 2020–Present — BMW X6 M (F96)

OEM Front Seal Part Number: 54105B32973

OEM Side Seal Part Number: 54107493151

Specifications

• Material: TPU (Thermoplastic Polyurethane)
• Shore Hardness: 95A
• UV Resistant: Yes
• Weather Resistant: Yes
• Country of Origin: Canada

A Note on Warranty Seal Replacement

Vehicles under warranty may qualify for seal replacement under TSB MC-10205090-9999. However:

• Replacement seals use the same material and will shrink again
• The procedure requires sunroof glass removal, risking damage to adjacent seals
• Some owners have opted to use this kit instead to avoid the risks associated with glass removal and reassembly

This kit provides a non-invasive alternative that installs in minutes without glass removal.