71 Duster Bucket Seat Vs 72 Duster Bucket Seats

Johnny Dart said

Any chance a 70 seat foam will work ?
From my experience, 70-72 bucket seats were very close
in structure. 73 is when there was a change.

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70-71 seats has the springs attached to the frame so 70 foam on a 72 won’t work as 72 foam has the springs molded into the foam
So when I take the old foam off my 72 seats you’ll see bottom spring but no back spring like on the bottom