Just to throw something else into this pot of stew!
While pitbike wheels have been found to be a very good option, it's still not "the only game in town". Graham Hill purchased wheels for his MG, they are neither the original Honda CT type wheels, nor are they Pitbike, "Bentaxle" on the US forum site uses yet another well known brand of wheels from small moto x bikes.
I guess what I'm suggesting is that there are always options to explore. Some may be a bit more expensive, some are cheaper. It's usually worth spending more time trolling for options.