Floors

I have a 66 Valiant wagon in need of rear floors, I can find replacement pans up to 65 and 67 and up. Did I get a 1 year only model? I have a sheet of 18 guage that I can beat and bend into approximate shape if I need to, just looking for the easy route.
Sadly yes 66 is the one your model for the entire line if you just have to replace the front check for 66 barracuda as my understanding is they are the same