Sierra Serpentine Belt 18-15121 for MerCruiser
- Brand:
- Sierra
- Part no:
- 18-15121
Where to buy
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This is the Sierra 18-15121 serpentine belt, matching MerCruiser OEM number 57-865615005. It measures 87.5 inches long and 13/16 inch wide. The applications shown begin with 2001-05 engines such as the 350 Mag MPI. Complete application information is in the Sierra catalog, so check it before trusting a match.
Our take
At 87.5 inches long and 13/16 inch wide, this Sierra belt is a fixed size, and it matches MerCruiser OEM 57-865615005. The 2001-05 engines shown, such as the 350 Mag MPI, are a start only, so confirm in the Sierra catalog.