Replacement part for machines with serial numbers beginning with 32U#####. This kit contains everything needed to replace the Eccentric Assembly. When replacing, Square Scrub recommends installing new isolators as well. Included are : Aluminum driver plate with isolators, Motor Shaft Spacer, Shaft cap bolt, Bearing bolts, Eccentric assembly, Crush washer, Eccentric assembly key, White grip face, Anti-seize, 100% Silicone.