Legendary seems to indicate that they are different
Not saying they're the end-all
1963-1966 Plymouth Valiant Signet Hardtop Trunk Mat - Gray Plaid - Legendary Auto Interiors
As stated earlier. Year, make, model are needed.
Inner fender or splash shield come to mind.
As an aside... throw a little something in the welcome wagon.
We kinda like to know a bit about you and the car... and pictures of your ride!
Welcome aboard
FABO Welcome Wagon