Replacement gasket for VMP Gen 3R blower. Based on stock bolt pattern with an large inside opening of 162mm x 82mm elliptical 18sq in. Only for use with billet throttle bodies VMP, FRPP, etc. Will not seal with stock twin 60mm throttle body. Installing the stock GT500 twin 60mm on a Gen3R requires an intermediate plate because the opening is large than the actual throttle body casting.