My hunt for inexpensive replacement wheels didn't turn out very well. I did find a wheel fairly cheap off e-bay to replace my worst one, but it ended up being just slightly wider than my current set. I tried taking a torch to the dented wheel and hammering it back into shape but no luck. I can't afford a new set of wheels right now, so I decided to mount the tires on anyways and hope they could be balanced out enough.
New tire mounted...

I gave the wheel a fresh coat of black as well. These new tires are a size larger; I think they'll fill out the wheel wells nicely.

First new tire washed & mounted, looks great!

I just had to take a picture of the Spitfire's new hood ornament...