This is not as easy as it sounds.
1. Do not get loop carpet of any kit, the modern versions are of miserable quality.
2. Most places make no distinction of early vs late floor pans saying all Pintos have the same carpet kit. They do not.
3. Vacuum formed kits never fit right. I have 4 installed and thy take a lot of work. A hot summer day will help them melt into place but they are never going to be like the original
4. Get extra for the load bay.
5. Like Dick1172762 says, they are all cut too narrow and are impossible to get to tuck into the side rails correctly.
Personally, It took me 4 tries to realize it is a waste of time and the final 2 cars I had professionally upholstered for double the price.