14x7s are likely off of a late 70s T-Bird or Cougar. I ran a set of them prior to moving up to 15s. They get awfully close to disc brake calipers, but you can put a 255 tire on them just fine. The Magnums that came on early Mavs were 14x6 from the factory. Don't know if big bumper cars had the wider ones available. If there is no interest here ... put them on eBay. Looks like a clean set, someone will want them. I would bet that the trim rings go for $100 by themselves. That is if they are the correct ones. Is there more than a 1/2 inch gap between the ring and the wheel center?
Sounds like the right trim rings for them. They aren't rare, but they aren't as easy to get as 14x6s either. Someone will want them.