Scott there were two common rim widths at that time. 9" and 10". If you have 9", I recommend the 11.2-38 which replaces the old measurement calculation of 10-38. If you have the 10" rim, I always use 12.4-38. Punch below and select tractor rear in the left tool bar to see the various sizes that M.E. Miller sells. They advertise on this site.