BMW part number 63121394252 is a headlight intermediate piece (also listed as a fixed mounting rod or low-beam adjusting element) that fits 1987–1995 US-market BMW E32 7 Series and E34 5 Series models (plus 1989–1993 E30 3 Series ellipsoid/smiley headlights in European and late-production catalogs). Like 63121378339, it serves as the fixed-length ball-pivot spacer stud that anchors the headlight bucket to the metal carrier frame.
- E32 7 Series (1988–1994). Fits 735i, 735iL, 740i, 740iL, and 750iL models (including standard halogen and 1993–1994 Xenon headlights).
- E34 5 Series (1989–1995). Fits 525i, 525iT Touring, 530i, 530iT Touring, 535i, 540i, and M5 (3.6L) models.
- E30 3 Series (Euro Market) (Late Production Ellipsoid). Listed in global catalogs for post-09/1989 E30 models equipped with Bosch/Hella ellipsoid low-beam assemblies.
How It Differs from 63121378339
- Low-Beam vs. High-Beam Length. On E32 and E34 dual-lamp assemblies, the low-beam projector bucket and high-beam reflector bucket sit at slightly different depths inside the carrier frame.
- Application Split. BMW pairs one fixed intermediate piece (
63121394252 for the low-beam housing, and 63121378339 for the high-beam or opposite bucket depending on year) with two threaded aiming screws (63121378368) and three rubber bushings (63121378369) per lamp.
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