76 Duster floor pans/seats

So I just got done installing my US cartool sub connectors. and found out the hard way that the 76 floor pan must be quite a bit diffrent from the 75 and older ones. Now I need a new carpet(4sp) and I would like to put diffrent bucket seats in. The ones that were in the car when I got it are trashed and I think they came out of a Chevy S10. So my questions would be has anyone replaceed the carpet in a 76 car and how did it fit and also what seats have you used other than original ones. I don't want to spend 5-600 for seats I have to recover and If I go with diffrent seats I'd like to get them fitted before the carpet so I can weld up all the extra holes in the floor.