Rear Fold Down Seat - Are they more desirable?

I just picked up a 75 that appears to be fully loaded and has the rear folding seat option. Is this a desirable feature in the world of Dusters? Were they only put in special versions? My son and I are new to the A-Bodys, but somehow now have 2 of them. The 75 was meant to be a parts car, but is actually in pretty good condition too and complete.