If one of the bushes you require is #28 in Mark's diagram above, I may be able to help. If I remember rightly, that Bronze Bushing is 1/2" bore x 9/16" x 3/4" flange (part nbr 6229).
I need to make one myself .
If you need others like PTO Lever Rod bushes or the Fender Seat pivot bushes on the earlier models (different sizes and part nbrs), I also have made these for my Tractors.
I'll have to check my stock of Gunmetal Bronze, but sure I have enough to make a few more.
Send me a PM of you need any more help.