Dear Kirk, Your tractor is a 1929 model. As for the head gaskets, if you are very careful, when you take the heads off, you may be able to reuse them, especially if you use one of the headgasket sealers, that are on the market. I know that there is a company that supplies some parts, for the 20-35, but I can't remember who they are, offhand. I live in western South Dakota, and I believe, that I have an extra steering sector, for the 20-35. But, I live a long way, away from you. If you're interested, please feel free to contact me.
Happy Tractoring, Ken