Oh no,
Sorry but I missed the fact that it is an Eldorado. They do have a very unusual wheel design. I could see where the extreme offset would make them prone to damage. As far as the tires touching the wheelwells most of us ex-teenage hotrodders are familiar with rolling the wheelwell edges flat, helped me get those 50's on the rear of my old Torino. Maybe the Caddy could use a little help in this area as well?
What do these custom wheels you have located look like? You might need to get a set of Vogue Tyres to go with them but watch out, your Eldo might end up looking like a pimp-mobile.
Chas