We are considering wire wheels for the '57 and I've been searching around for them.
They are available from several sources including the Thunderbird parts suppliers and prices vary. Google will find them for you. The KH wires are (in my opinion) the most beautiful wire wheels made BUT they are a real PITA to keep clean. I have 3 sets - original, repo 52 and 56 spoke style - the repos look nice but are not as heavy as the originals. Many have experienced broken spokes on the cheaper versons, but the stainless spokes seem to hold up better than the chrome. No matter which style you get, remember you will have to use some sort of protection between the tubes and the nipples on the inside. These are beautiful wheels, but can be a bit annoying to deal with in the long haul.