2.5 Gallon Fatbob Gas Tanks Harley Chopper Shovelhead Panhead Thin Custom Big Tw2. 5 Gallon Fatbob Gas Tanks Harley Chopper Shovelhead Panhead Thin Custom Big Twins 1936 1984 4 speed frames with stock mounts, direct bolt on with adapter mount no gap in center, nice clean look, told these were designed after the old WR Racing gas tanks on the harley flatheads nice narrow, clean line look for your custom!!!! selling as pictured. more than welcome to pick up at shop in butler pa & save shipping.