Can Anyone identify These Fender Skirts? Linda Needs To Know

Fender skirt

I got an e-mail from Linda, and she needs help. She came to the right place; given all the Clues you guys guess, these should be a piece of cake. One thing I already know: they’re not for a ’75 Cadillac. Linda bought them at an auction; they’re marked ’75 Caddy, and the backside has the marking 10009110 RH Armco. Is that a giveaway already? Anyway, Linda wants to sell them on ebay, and it would help if she knew what she’s trying to sell.