I have the rubber floor mats from AMES in my Firebird. I think they look good. They are a bit soft and flimsy compared to floor mats in other cars, but maybe the originals were like that too? I see that AMES sell them in black, blue, parchment and red. I have the black ones, part number FA301BK.
Agreed, the Ames repros are excellent. Here's a comparison of one of the rear mats I purchased from a Pontiac dealer in 1969 and one from Ames. (Those curled edges are expected on the rears as they are not a perfect fit and never were.)