Bullet-proof version of the stock transmission mounting plate which is guaranteed not to bend or flex. Precisely machined from Swedish Domex 650 (high strength fine grained construction) steel, with 3 front holes to make it compatible with all 4-speed Big Twin frames. Unlike the stock plate it features double material all the way to the rear end to provide extra rigidness when used with Cannonball electric start systems. In stock replacement applications you will need a custom transmission adjuster.