This part is listed by BMW as BMW part number 41141871979 (41 14 1 871 979) and is the bracket used to secure the lower portion of the coolant expansion tank to the wheel well/fender on 1988+ E30 325i models. BMW incorrectly describes this as a Windshield Washer Tank Support Bracket (maybe it was on other models). The lip on the expansion tank slides into this bracket. Welding required if replacing or adding this to an early model. Since the Euro E36 uses the same tank it may also be useful when retrofitting the Euro expansion tank to E36 or S54 swap (we have not confirmed).
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
BMW Fitments:
3 Series
E30 (84-91) > 325i
E30 (84-91) > 325is
E30 (84-91) > 325ix
E30 (84-91) > M3
5 Series
E28 (82-88) > 528e
E28 (82-88) > 535i