BMW's A-pillar cap with AIRBAG write.
The design was made based on that of an E90, but RealOEM (code: 51432251367 & 51437138816) gives me it compatible with:
BMW 1 Series E8X
BMW 3 Series Compact E46
BMW 3 Series E9X
BMW 5 Series E39
BMW 5 Series E6X
BMW 6 Series E63
BMW 7 Series E65
BMW X3 E83
BMW X5 E53
BMW X5 E70
BMW X6 E71
The author marked this model as their own original creation.