It's been my experience that the dealer is about the only option to get wheels
because Kubota uses metric bolt patterns and a different offset for every
tractor model they make. Unless you find an aftermarket supplier that builds them special order such as Wold in Iowa ( I think that's where they're at ) so
contact them and compare that to the dealer.
When contacting the dealer ask them about "whole goods" as I've seen cases
where a brand new tire and wheel combination is cheaper than a bare wheel
thru their normal parts ordering depot. Unreal the difference sometimes and it
can be either way so shop wisely making sure you get the correct wheel and
the best bang for the buck you're spending.
Al