Google "parker wheel motor parts " Download the pdf from Parker about torqmotors, should be the first pdf ya come to. Also check out J Thomas site, they have some cross references.
Have Googled for a cross reference? Fleabay has a bunch of em listed.
The original parker seal kits run about $58 or so, not sure about the bootleg kits
The bearing can be had from any bearing supply.
Now the shaft.............
It ain't rocket science!
'Course if yer house has more wheels than yer truck...