A-PILLAR MIRROR TRIANGLE TRIM, LEFT

The Left A-Pillar Mirror Triangle Trim (Tesla OEM 1130655, also known as the Ext Mirror A-Pillar Applique LH) is the triangular black ABS plastic trim panel that fills the junction between the front door mirror housing and the A-pillar at the base of the windshield on the Tesla Model 3 and Tesla Model Y. It is positioned on the front left (driver-side) door, fitting snugly between the mirror base and the door glass run seal. The paired right-side unit is Tesla OEM 1130656. Later Model Y production uses updated numbers 1495632 (LH) and 1495633 (RH).

On the Tesla Model 3 and Model Y, the exterior door mirror is mounted to the door at an angular base that leaves a triangular gap between the mirror housing and the A-pillar where the door meets the front windshield. The 1130655 triangle trim fills this gap. Its functions are: sealing the joint to prevent wind noise intrusion at the A-pillar corner during motorway driving; covering the mirror mounting bolts and harness entry point at the door face; and maintaining the vehicle’s clean, aerodynamic exterior profile between the windshield and door mirror.

The trim is clip-mounted to the mirror base and door frame without screws, making it straightforward to replace but also susceptible to damage from car wash brushes, minor parking impacts, and UV degradation. The gloss black ABS surface is prone to visible scratching and UV fading after several years of outdoor exposure, particularly in high-UV climates. Wind noise at the A-pillar corner is frequently the first symptom of a dislodged or cracked mirror triangle trim on the Model 3 and Model Y.

Plastic automotive trim panels are classified under HS 3926.30. Verify the exact subheading with your customs broker. The low unit value and compact size of this trim make it well-suited to inclusion in mixed trim clip and accessory shipments.

Difficulty: Very Easy. The A-pillar mirror triangle trim is one of the simplest replacement procedures on the Model 3 and Model Y. No tools are required for the trim itself. The existing trim is released by prying along its inner edge; the new trim clips directly into the same mounting points. Estimated time: 2–5 minutes.

1. 1
   Open the front left door fully. With the door open, the mirror triangle trim is visible at the junction between the mirror base and the A-pillar at the front of the door aperture. Inspect the trim for the type of damage or confirm it is the unit to be replaced before removal.
2. 2
   Release the original trim using a flat plastic pry tool. Insert the tool along the inner edge of the trim (the edge facing the glass run seal) and pry gently outward. The trim is held by clips engaging the mirror base and door frame — work progressively from one clip to the next rather than levering at the centre, as the ABS plastic can crack if forced. If the trim is already cracked or damaged, the removal method is less critical.
3. 3
   Inspect the clip receiver locations on the mirror base and door frame. Confirm the clip towers in the mirror base and door frame are undamaged and that the new 1130655 trim’s clip tabs will engage them positively. Clean any debris from the receiver locations.
4. 4
   Align the new 1130655 trim with the mirror base profile and press firmly to engage the clips. The trim is designed for a specific orientation — confirm the profile matches the mirror base contour before pressing. Press progressively from one clip to the next along the trim perimeter until all clips click positively. The trim should sit flush with the mirror housing and door frame with no gaps visible from outside the vehicle.
5. 5
   Road test at motorway speed to confirm wind noise elimination. After fitting the new trim, drive at 80–100 km/h with the windows closed and confirm the A-pillar wind noise is no longer present. If wind noise remains after fitting the new trim, the glass run seal adjacent to the mirror base should also be inspected for damage or misalignment.