Bucket Seats????

I was wondering if anyone knows if any set of bucket seats from 70 - 74 A Body will properly fit in my 71 Swinger. I have the Motorbooks Workshop Chrysler Parst Interchange Manual and seems the 71 inner rails cannot be interchanged with any year, but outer rails can be interchange with 70 model years. So am I to assume that only 70 and 71 bucket rails will only fit in my 71 Swinger or will any 70 - 74 A Body buckets bolt right in, or is it just 71 specific?