OEM Seat Covers for 1950 Buick Super Riviera (Model 52) WANTED

I have acquired a beautiful 1950 Buick Super Riviera with a green exterior. It recently had new original style seat covers professionally installed....only issue to me is that primary color of the seat covers is red! If they can be found, I would prefer covers in green. black, or gray. I would purchase them outright or could trade my red covers if that was desired.