This is a Expanding Rivet, also commonly referred to as a push-fit plastic rivet, trim clip, or trunk lid trim retainer. It's a small, essential component used for securely fastening various trim panels and components in many BMW models.

Key Features:

Clip Size:
Hole Size: Designed for an 8mm hole
Head Diameter: 15.5mm
Stem Length: 13mm

Usages:

Primarily used to secure interior trunk trim panels
Commonly found within the boot area or tailgate lining
Also used to secure bumper covers
May also be used for radiator support air ducts
Can replace missing or broken rivets in various positions on the vehicle

Vehicle Fitment:

This rivet fits a wide variety of BMW chassis and models, including:
E46 (323Ci, 323i, 325Ci, 325i, 325xi, 328Ci, 328i, 330Ci, 330i, 330xi, M3)
E61 (525i, 530xi, 535xi)
E88 (128i, 135i)
E90 (325i, 325xi, 328i, 328xi, 330i, 330xi, 335d, 335i, 335xi, M3)
E92 (328i, 328xi, 335i, 335is, 335xi, M3)
E93 (328i, 335i, 335is, M3)
F01 (740i, 750i, 750i xDrive, Alpina B7, Alpina B7 xDrive)
F02 (740Ld xDrive, 740Li, 740Li xDrive, 750Li, 750Li xDrive, 760Li, ActiveHybrid 7)
F25 X3 (X3 sDrive28i, X3 xDrive28d, X3 xDrive28i, xDrive2.8i, xDrive3.5i)
F26 X4 (X4 M40iX, X4 xDrive28i, X4 xDrive35i)
I01 i3
MINI (Various models and submodels)

Specific models such as the iX, X7, and more

Note: Always use a vehicle selector tool or consult a BMW parts specialist to confirm fitment for your specific vehicle.

How it Works:
v The rivet is designed to expand when the center pin is pushed in, creating a secure fastening. This provides a quick and easy way to attach trim panels and other components to the vehicle body.