GM Turbo Hydromatic TH400/TH375 Rear Ext Hsg Seal & Bushing Part# 44074,34066 Please Note: There are different size rear seals & bushings be sure to measure your old ones to insure you purchase the correct parts! If you need the 2.500" 2.700" or the motor home style 2.874" just let us know we have all of those available. Seal, 400 Rear (2.380” OD) (Small, 375 Type) 1964-Up Bushing, 400 Extension Housing (1.995"OD) 1 1/2" long 1964-Up