Vic,
You mean like this?
I got mine from Rocky Mountain Classis Mustang in Littleton, CO. Their website seems to have gone away (try a web search. Their phone number was 303-771-5830). These are standard licensed items, and probably anybody who can supply the Cobra covers can order them. You might try Tony Branda if RMCM is no longer around...
And if somebody offers you a used set, try to make sure they're not off my car!
Edit: Found them at Mustangs Unlimited
(black) or
(polished)