I'm assuming that you have the white-painted wheel with the red and blue stripes. This is probably the most common trailer wheel around, and any tire dealer should be able to get one for you if he doesn't have one in stock. I've also seen them at WalMart, Tractor Supply, and the online trailer parts place like e-trailer.com.
As I recall, the specs are
5-lug
15x6 (6" wide)
Offset 0
Lug bolt pattern 5 on 4-1/2"
One thing to be sure of is the load-bearing capacity - the weight (actually half the weight) of a fully loaded TM. To be safe, I would look for something like 2500 pounds. The load rating is often stamped on the inside of the wheel - the part that is covered by the tire and is not visible when the tire is mounted.
The other place where you can get messed up is in the air pressure rating. It must be rated for the max air pressure you plan to use, which is 80 psi if you plan to use Load Range E tires.
Bill
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