I would look for a 9" in the 50's through 60's years that has either of the wheel bearing sizes. The best bet is to find one with a driver's side axle in the 25" to 26+" range. This will allow you to shorten the passenger side only. The passenger side axle should be in the 29" + or - range. You will need to look at the drum register diameter on the axle flange and try to match these up, but register rings are available to correct for this. Also bearing offset that determines drum/shoe width must match from axle to axle. Just measure through the hole in flange from outer face to the bearing and match these up. An example: 26 1/16" driver axle plus 1 1/16" gap for spider gear shaft plus 29 5/8" passenger axle gives you a 56 3/4" flange to flange width. Great for 7" wheel and 3 3/4 wheel offset. The pinion offset is influenced by the axle length difference from side to side. Small bearing axles come in shorter lengths.