Miller tire has a ring spacer that goes between the rims and uses all thread and nuts i think. been a while since ive looked. Or you could go a route like Willam did and make your own. His is adjustable like the big IH tractor axles and is bolted to the hub. Cant find the thread at the moment but a pretty awesome set up!
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1967 IH Cub Cadet 123
1978 IH Cub Cadet 1650
19?? IH Cub Cadet 682
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