Used 14mm 31 HTD tooth blower pulley. This pulley is 3.50" wide and has a 2.00" register with six .375" bolt holes on a 2.782" bolt circle. Pulley is made from billet aluminum and is hard anodized for wear resistance. Fits 4-71 thru 18-71 roots and screw superchargers.
Pulley is hard anodized for wear resistance and corrosion protection. Pulley has one offset hole for early type crank hubs that have one offset mounting hole but pulley can be used on crank hubs with all six bolt holes that use equal bolt spacing with no issues.