Expanding on Jeff’s DSO/SVO information…
It appears there were not only different springs for both the GT350 and the GT500 but...
There were also different front springs for a GT350 with and without A/C and a GT500 with and without A/C
We don't have all of the SVO sets yet but, here's a list from the SVO / DSO documents we do have;
-DSO 84-2571 -C7ZA-5310-AN 200F GT350 Manual
-DSO 84-2572 -C7ZA-5310-Y 201F GT350 Manual with A/C
-DSO 89-2606 -C7ZA-5310-AN 210F GT350 Auto
-DSO 84-2517 -C7ZA-5310-Y 211F GT350 Auto with A/C
-DSO 89-2613 -C7ZA-5310-Y 213F GT350 Auto with A/C and with Thermactor
-DSO 84-2528 -C7ZA-5310-N 400F GT500 Manual
-DSO 84-2530 -C7ZA-5310-N 402F GT500 Manual with Thermactor
-DSO 84-2560 -C7ZA-5310-N 410F GT500 Auto
-DSO 84-2602 -C7ZA-5310-S 413F GT500 Manual with A/C and with Thermactor
We're (SRG) still trying to gather all the SVO sheets sets for every DSO group.
Here’s a link to the thread listing what we have so far.
https://www.saacforum.com/index.php?topic=3978.0