This part is listed by BMW as BMW part number 11311309945 (11-31-1-309-945) and is described as Timing Chain Tensioner Guide Rail - E34 M5, E28 M5 and E24 M6.
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BMW Fitments:
5 Series
E28 (82-88) > M5 (87-88)
5 Series
E34 (89-95) > M5 (91-95)
6 Series
E24 (77-89) > M6