One new aftermarket replacement fits International / FARMALL exhaust manifolds that fit Tractor models: 666, 686, 706, 756, 766, 806, 826, 856, 2706, 2756, 2826, 2856, Hydro 70, Hydro 86 with gas engine *656, 460 and 560 models require cutting hole in hood or ordering offset exhaust adapter separately. Combine models: 303, 403, 503, 615, 715 (gasoline) Please note: – Does NOT come with gasket. – If you have 460, 560, 606, 660, 2606 or 3616 you will need exhaust adapter. This adapter offsets the exhaust port to align with the tractor hood and also reduces the pipe diameter to 2″ NPT. Models this part fits: 2756, 2826, 2856, 303, 403, 503, 615, 715, Hydro 70, Hydro 86. Reference numbers: 384290R1, 384290R1-A, 384290R21, 384290R21-A.