Some trivia...
> When the "bulged 1/4 panel" A-body came out in 1970 (Duster), the engineers wanted a wider axle housing. Bean counters quashed it. Everybody commented on how "lost" the rubber looked on 1970 Dusters (rear).
> Then, in 1973, when the 4.5" BC / slider brakes (wider track setup) came out, the Duster / Dart Sport looked so silly (stock) with front wheelhouses looking "full" and the rears "empty", that there was actually a TSB telling service managers that this visual effect was normal. Which it was.
Comments above, re: basic body dimensions and suspension components unchanged 1967-'73, are 100% correct.
Rick