Wilwood Iron ProSpindle Hardware Kit (Castle Nuts, Washers, Cotter Pins)

The small but essential hardware kit every Wilwood Iron ProSpindle install needs — castle nuts, washers, and cotter pins sized for Wilwood spindle part numbers 831-15931, 831-15932, and 831-15933, used across our Chevy/GMC C1500 spindle and big brake kit lineup.

The stock C1500 spindle nuts and washers will not work with Wilwood's Iron ProSpindles — this kit is required, not optional, any time you install a set of Wilwood Iron ProSpindles. Order it alongside your spindles so you're not left waiting on a second shipment mid-install.