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Hmmm I'm not too sure why you're ordering a new rudder if you just broke the tail wheel... is there more extensive damage to the rudder??

Rudders are just a balsa wood frame placed together with CA glue and a couple of supports and then covered with your choice of covering material. The average Rudder can be put together in 1/2 hour or so; covering to folow. (See attachment)

The Wheel assembly is just wire and very inexpensive, start bending until you get something that you like (see same attachment) - throw away the first 5-10 trials (tell no one... )

To remove an old hinge take out your Dremel tool and attach a rotory cutting blade. A couple of precise passes will excise the old hinges. If the new slot is too large for your new hinge; fill in the hole with a thin slice of balsa and cut a new slot for the hinge.

Your problem can be solved in one evening in your workshop for under a dollar.

Good Luck