This part is listed by BMW as BMW part number 18111178137 (18-11-1-178-137) and is described as Genuine BMW Exhaust Pipe Flange for E28 535i, E24 635CSi, and E23 735i.
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E28 (82-88) > 535i
E24 (77-89) > 635CSi
E23 (77-87) > 735i