E-Z-GO 19186G1P Brake Drum/Hub Assembly (Electric) Used on 1982-current E-Z-GO Electric Vehicles and 1982-1993 2-Cycle Gas Vehicles This hub/drum is a replacement for the earlier (before 1982) hub & drum andhas the star spline instead of the straight key. Has a 3/4-Inch center hole with a 24-tooth star spline This hub/drum will NOToperate with a keyed axle/hub interface. The drum is held in place by a castellated nut (5/8-Inch x 18tpi) and a thick (.118-Inch) flat washer.