When I was researching rear rims for my BX22, I came to the realization that all the BX series tractors use the same rim and bolt pattern. I purchased the Jeep spacers, and bought 1/2"-20 flange bolts from McMasterCarr that were 1 3/4" long. I cleaned the bolt holes first with brake cleaner, and then screwed in the bolts from the rear, until they were 1/4" from the axle flange. One at a time, I put a drop of red loctite on the threads at the head, and tightened them down. Once I had all 5 done, I torqued them to 90 ft pounds. I then installed the spacers, and used heavier nuts (used 13/16" socket that I purchased, and torqued them to 90 ft pounds. Mounted the tires & rims on the studs, and tightened them to 90 ft pounds also. The reason I used the flange bolts instead of the original Kubota bolts, was that I didn't want to loctite those bolts in incase I had to remove the spacer at a later date. With my method, should I ever want to remove the flange bolts, all I would have to do is to heat the heads, and unscrew them, and wouldn't have to go anywhere near the spacers with the heat. Right now, I can remove the wheels and spacers in less than 5 minutes using my impact gun and wheel skate.
PS.. While researching the rims, I came across a Kubota wheel spacer, part number
SPACER, REAR TIRE
The part fits the 2 models listed below:
BX22D
BX23D
