Mercruiser V6 V8 Serpentine Belt Idler PULLEY Set MPI Pulleys 4.3 5.0 5.7 6.2 L
4 1/4 groved pulley replaces part number 864625T. 3 3/16 smother pulley replaces part numbers 8M6500024, 865598. using your model or serial number. We're pleasure to help you.