Check EBAY under Agriculture and search for Farmall Super or Farmall C and you will find new Zenith carbs for the Supers. Be aware that you may get sticker shock, but they can be had. Personnally, if the carb is not too bad off, I'd try and rebuild. they are very simple and easy to work on... Good Luck and get another 50 years out of that Super A. BobG in Va