or rings to make the wheels fit? Pitty to let them go!

Hub rings are used to make a larger hub hole in the wheel mount properly on a smaller hub mount on the car, not the other way around.

The only way your existing wheels could fit is if the hub hole in them are already larger, and hub rings are used to make them mount on the smaller mounts.

Most (if not all) BBS wheels have hub rings, so swapping them for the correct size is worth investigating. Call BBS of America in Braselton, GA at (877)832-8209. I called them last year when I found I was missing a center cap retaining ring on an old BBS RK wheel and they sent one out ASAP no charge.