This part is listed by BMW as BMW part number 11151306958 (11 15 1 306 958) and is described as Genuine BMW Crankcase Vent/Breather Hose for S38 engine on E28 M5 (1987-1988) and E24 M6 (1987-1989).
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BMW Fitments:
5 Series
E28 (82-88) > M5 (87-88)
6 Series
E24 (77-89) > M6