Holy crap Dennis, Ford screwed up the seats during the Dent Side era? :/
Guess which seat frame is from a '75 Super Cab and which piece-of-sorry
back-hurting-crap is from my stepfather's '91 Super Cab...
The "square wave" springs are -junk!- and haven't got anywhere near the
yield point strength of the "sine wave" springs' wire. You can see them
mashed-down and staying-that-way there. Pure junk, those.
On top of that (effectively) left half the springs out!
Here's my "fix" for it and two years later the scheme worked...
Alvin in AZ
ps- Photobucket sucks, always did and always will IMO. YMMV?