I have a 1949 and a couple years ago I put in a C 60 engine from a numbered. I believe the year was a mid 70s year. When I bought it the seller gave me a new jet for my existing carburetor. I believe the orifice was larger in diameter and he said I would get more performance from the newer engine using this plug in my existing international carburetor. However no surprise I lost that yet and was never able to install it. Would anyone know what that orifice diameter might have been and if I can purchase a jet of the size somewhere. Thanks.