Front struts/shocks on the E30, E28, E34 525i, E24 are mounted to the chassis with this front upper strut mount. It's a dense rubber mount that also incorporates a bearing that allows the strut to rotate as the steering changes. Over time the rubber breaks down and the bearing wears out and the entire mount should be replaced.
This part is listed by BMW as BMW part number 31331139452 (31-33-1-139-452) and is described as OEM Corteco Front Strut Mount, E30 E28 E34 E24.
Supersedes BMW Part Number 31331124508 (31-33-1-124-508).
This is a OEM E30 strut mount manufactured by Corteco - an original supplier to BMW for many steering and suspension components. As an OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.
BMW Fitments:
3 Series
E30 (84-91) > 318i
E30 (84-91) > 318is
E30 (84-91) > 325e
E30 (84-91) > 325es
E30 (84-91) > 325i
E30 (84-91) > 325is
E30 (84-91) > M3
5 Series
E28 (82-88) > 524td
E28 (82-88) > 528e
E28 (82-88) > 533i
E28 (82-88) > 535i
E28 (82-88) > M5 (87-88)
5 Series
E34 (89-95) > 525i M50
6 Series
E24 (77-89) > 633CSi
E24 (77-89) > 635CSi
E24 (77-89) > M6