You can get trailer tires at Walmart every day and many farm stores. Cub Cadet rears work on Cub fronts if the offset isn’t too much. Most vintage garden tractors use 5 on 4 3/4 bolt circle. Many two wheel tractors also use the same pattern. Ford and Dodge use 5 on 4 3/4 on many cars. Small skinny space saver spares for some modern cars will work also. Make sure center hole is large enough to go over hub. You could even use 13”,14”,15”,16” if that’s what you find that will bolt on for temporary. Be cautious when using trailer wheels with original lug bolts as they have bigger holes and the lug bolt can slip through the wheel lug holes. I have one that wants to come off this way. (Not using tractor, only sitting in storage.)