Floor Shifter Hump, Manual Transmission, steel. This hump welds to floor pan and it is used on all Cutlass & 442 with bucket or bench seats. This shift hump is made out of correct steel, and looks and functions like original GM. Your manual shift boot attaches to it. You can now get the proper steel hump if you’re putting a 4-speed manual transmission in your car. This allows the floor pan to be altered to accept the factory shifter the way GM did.