This sale is for a rebuilt original Marvel Schebler TSX carburetor. It has been completely taken apart and Ultrasonic cleaned and bead blasted inside and out. Correct bits run through passages and blown out. New throttle shaft, float, float valve, float pin as well as gaskets and screws installed. And all machine work done as needed. It has been tested for leakage and flow and comes with mounting gasket. It has a 2-3/8" mounting bolt pattern and a 1" bore. It is adjusted to correct settings to start your tractor, fine tuning will be needed. This is the the correct carburetor to fit Oliver 66 and 77 tractors. NOTE: You will receive either a TSX 363 or 418. Please see pictures. We describe our items as accurately as possible. We do not know everything, so look at the photos as well as reading description completely. I will ship internationally and will combine shipping on multiple purchases.