Since nobody here appears to have an answer for you, check with:
www.automotiveinteriors.com

While I was in San Diego I went there with a list of just about every piece or rubber for my Fairlane Club Coupe.
Over the years most of the rubber was either missing, torn or just brittle.
Most times when I go shopping for stuff like this I get "we can order it " or some other lame excuse.
Good prices also.
They had everything!
Matthew answers the phone and Clayton is the sales manager.

I would google stainless steel hole caps, I saw a  lot of sizes, they might do in a pinch...

hey all. finally getting to the woodgrain on the bermuda. don't have all the stainless caps, looking for info on where to find these. tried the usual sources ( carpenter,jerrys,resto.specialties) had no luck. maybe, some squire guys might know, or have some extras? thanks Gerald .

Yes, especially for the Cougars, anything that is not a crossover from the Mustang is crazy $$$$$

Hope you sell your old parts to someone that needs them.  If you have been doing this for a while, you know what a task chasing odd parts can be.

SWEET! Bet you get a bowl of ice cream after dinner tonight as a reward! 

What kind of headliner material would be used in a 57 Ranchero?  white perforated vinyl or vinyl with a black dot or . thanx in advance.... Tobby