This part is listed by BMW as BMW part number 11511312539 (11511312539) and is described as Genuine BMW Engine Coolant Pump for E28 M5 (1987-1988) and E24 M6 (1987-1989).
Supersedes BMW Part Number 11511312129 (11-51-1-312-129)
This Water Pump for S38 engines is a Genuine BMW part, offering maximum durability and optimal engine cooling.
Water Pump Gasket Sold Separately - See below for a product link in BimmerWorld Recommended Related Items
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BMW Fitments:
5 Series
E28 (82-88) > M5 (87-88)
6 Series
E24 (77-89) > M6