Welcome aboard. As LockDoc said there are different springs used for different years and whether it was a full foam seat or not. This thread and the links in it may help you ID what you need.
On another note I had zero luck ordering the springs I needed a couple of months back (Covid related) so your best bet may be to find a local upholstery shop who will make them for you.
Good luck.
https://67-72chevytrucks.com/vboard/...d.php?t=804108
And as Doc said post some pictures. We love pictures around here.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread
http://67-72chevytrucks.com/vboard/s...d.php?t=698377