#F65A 8600-BB - 9 blades - steel - (used only on the 4.2 engine) - on the side that faces the radiator and is stamped "front", each blade will have "4.2" stamped on it , Under 8500 GVW , ENG.SZ.: 6
#F65A 8600-AB - 9 blades - steel - on the side where the hub bolts up and mounts to the fan, and stamped "front", there will be the letters "KG" stamped , ENG.SZ.: 6