Spectre's high quality crankshaft, alternator and engine pulley sets are designed to help dress up your engine compartment. All of our pulleys are designed to work in OE applications and with the OE style serpentine or v-belt configuration. Product Features:Triple chrome-plated steelDouble belt grooveFor long nose water pumps, 6-1/4 In. diameter, 2-1/4 In. bolt spacing- note: identify the water pump by looking at the distance between it and the timing coverEasy to install with no special tools or skills required