I was going to say that from the factory there was no carpet under the seat;
It went up over the lip, but did not extend that far back.
(I believe I photographed my cars carpet install before replacing the carpet in the early 2000's)
It seems that most people leave the carpet there - and this shouldn't be a bid deal...
I do believe that the seat rear bottoms which had retractable (male) belts had indentations to clear the retractor - but I do not believe that the cars which had a standard length belt (as '71 ect would have had) had these indentations;
I would think the seat should still fit, but might be a bit tight.
Another question;
If you have left carpet under the seat bottoms;
Have you omitted the vinyl between the seat bottoms, or placed the vinyl (presumably with burlap backing) on top of the carpet?
adding material on the driveshaft hump, as well as adding retractable belts may only compound your problem.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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