V-belt pullies to drive oil cooler pumps are standard in most 9" Ford NASCAR applications. This pulley is designed for Daytona type pinion supports or MW's 57690 nodular iron ball bearing pinion supports. It can be purchased as a replacement piece for 39024 or 39924 pinion yokes or can be purchased separately to add to MW pinion yokes: p/n 39024-1 (for use with u-bolts), 39924-1 (aluminum for use with u-bolts), 39064 (built for caps), or 39063 (nickel plated and built for caps).