Holley Replacement Throttle Base Plate 750 d/p For Gas Only , HO112-116 # 12RGASHolley Replacement Throttle Base Plate 750 d p For Gas Only , HO112 116 # 12RGAS Carburetor Base Plate, Cast Aluminum, Model 4150, R4779 9, Each Replace your worn out or broken throttle base plate with one of these Holley replacement throttle base plates. They are manufactured from high quality cast aluminum and bolt on easily with no modifications. The Holley replacement throttle base plates include a new throttle shaft assembly, throttle blades, and