Genuine BMW Alusil Piston Rings Kit - E39 M5, Z8

This part is listed by BMW as BMW part number 11257843751 (11-25-7-843-751) and is described as Genuine BMW Alusil Piston Rings Kit for the S62 engine, found in both the E39 M5 and Z8 Roadster. These models were offered in model years 2000, 2001, 2002, and 2003. 

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BMW Fitments:

5 Series
E39 (97-03) > M5 (00-03)
Z Series
E52 Z8 (00-03) > Z8 Roadster (2000-2003)