Even if you get lucky and find some nos bushings for your '35/'36 cross shaft there is a better than 10 to 1 chance that you will also need a new shaft. That fiber or whatever Henry used inside the original metal cup bearing, un-oiled for many years, will wear deep grooves in the original shaft. I had posted a write up with pictures on the old ford barn about how I rebuilt some of these cross shafts for my cars using oil impregnated bronze bushings from McMaster-Carr. I reamed the bushings and made new shafts from the correct size bar stock and put Zerk fittings on so that I could grease the bushings as well. The cross shafts are working great and so are my mechanical brakes. Since I don't think we can access the old ford barn archives and I'm not sure if we ever will be able to again, if you send me a PM I will send you all the info I have, including MMC part number for the bearings I used, and some pictures that show all the parts.
ps....If you happen to be building a show car, after the rebuilt cross shaft is completed and painted, no one would ever know the difference between having the bronze bushings Vs. the original bushings.