Floor pan replacements

Good day everyone. I am new to the A-body world, so seeking some help here. I am familiar with the newer models (1965) and up, then became more familiar with the B-Body cars. I own 2 C-body cars. I am seeking advice on floor pans for my 1962 Plymouth Valiant. I am needing the full set or if I could find, a one piece pan. The one's in the car, well they don't exist, or not enough to patch. I have looked and see them for 63 or even 64 models, but I know the cars got a little bigger. Anyone have suggestions on some that would work, assuming they will need to be trimmed maybe. Hate for the car to be junked just because of no floor pans.