Dart Swinger seat covers . . . need help

Duster/ Dart Sport rear seats will not work in Dart Swinger. The bottom cushion might but the top is taller due to the design on the Duster/Dart Sport. There is at least a 3 inch difference in the height of the top of tha back seat. It may be possible to take a seat cover for the back of a Duster/Dart Sport and shorten the top cover to match the size of the Swinger rear seat cover. You would have to measure and see if the material would hold up to the tug of them hog rings though!
Chas.