Product details:

Keyser Manufacturing 100 15310-3: Fan Spacer, Billet Aluminum, Black Anodized, 3.00 in. Thick, 5/8 in. Male Pilot, 3/4 in. Female Pilot, Kit - These Keyser Manufacturing fan spacers are specially designed so that you can remove the fan without loosening the water pump spacer. They are manufactured from billet aluminum and are black anodized for maximum durability. The Keyser Manufacturing fan spacers include a reducer bushing, four countersunk water pump bolts, and four fan blade bolts. They are available in your choice of thickness and fit 3/4 in. or 5/8 in. water pump shafts with a 1 3/4 in. bolt circle.