Looking at a 1929 cat 20 serial 3042 runs ok but the pipe from carburetor to intake manifold is homemade was wondering if i should leave alone or try to find one? Also for some unknown reason bottom 1/3 of big brass plate on rear of seat has been torched off along with a portion of the seat plate? Any possibility of finding a used one or reproduction? Thank you. Also a picture of original throttle rod would be helpful too. Thank you guys