59 David Bradley Transmission Parts

I had some noise and a bad leak in my 59 transmission. I noticed the clutch/pinion shaft was wobbly. When I tore into it, it looks like the bushing was left to go bad and the big gear and pinion gear have worn pretty rough.

Is the only source of parts a good donor unit for these old horses?

I got to show it off at a couple of shows and plowed a little with it before I got too scared to run it more. I posted a picture of it here after I bought it.

there is a partial tractor on Ebay like it for $25 but it is up in Wisconsin and local pickup only