Product Description: Upgrade your Ford alternator's performance with this STS Parts 8-Groove Overdrive Pulley. Designed to fit 3G and 6G Ford alternators, this pulley is slightly smaller in diameter than stock—boosting alternator output at idle. It's perfect for vehicles running additional electrical accessories or performance setups that require more power at low RPMs. Made from cold-rolled steel for long-lasting use. Specifications: Bore: 17mm / 0.66" Outer Diameter: 58mm / 2.30" Belt Width: 27–28mm / 1.06" Grooves: 8 Material: Cold-Rolled Steel Fits: Ford 1st, 2nd, 3rd, and 6th Gen Alternators (Excludes 4th Gen & Clutch Type) Replaces Part Numbers: F3HU-10A352-AB, F3HZ-10344-A, F5TU-10A352-AA, F5TZ-10344-AA, F5UU-10A352-C1A, F5UU-10A352-C2A, F5UU-10A352-CA, F5UU-C2A, F5UZ-10344-C, F65U-10344-AA, F65U-10A352-A2A, F65U-10A352-AA, F65Z-10344-AA, F81U-10A352-BA, F81U-10A352-C2A, F81U-10A352-CA, F81U-B2A, F81U-C2A, GP693, GP711, GP718, GP720; Visteon ALT-C-009, ALT-C-011, ALT-C-181, ALT-C-182;