update-
I got the seals and tried them out... they seem to be exactly what I was hoping.
seals are 22x16x3 - probably any bearing house can get these.
Note: if the cast bronze bushing that comes in the kit was just a bit shorter, I think these seals would fit right in. This would cut the amount of debris getting in the bushing considerably. Providing a hardened shaft, slightly shorter bushing and seals would improve the kit for not too much added cost. It might add $30 to the kit depending on how many shafts are ordered at one time.
Here are a few and maybe last pictures of:
repaired and hard chromed shaft ground to 0.6286"
high temp plastic bushings from Igus GFM-1622-12
shims from McMaster to shim out to close to trans ears
seals
seal installed - note backwards because of shaft insertion direction
seal by itself
