Do they make rear wheel weights for a Kubota BX2200 tractor?
I think you got the answer you need, but I am curious why you want wheel weights.
Around 12 years ago I got my rear tires filled with foam. The filled tires weighed 181 pounds each. Adds a lot of stability on side slopes. I do not have a loader on the BX but the extra 300 pounds or so on the back would help if I did.
Just mentioning this in case you have not thought of this option. It cost me $110 per tire at that time, so not a cheap option, but a good way to get a fair amount of weight down low, centered on the axle.