I only have 1 x 75mm and 1 x 98mm SS discs. They are pretty expensive. So, wanted to make sure if I have multiple motors built for a launch day, I don't inadvertently use the wrong one. If I buy forward seal discs in the future, I will only buy the SS version.
Having said all that, I realized I was just being lazy. Went through Wildman's site and found only 5 motors that said the SS discs were required:
75mm:
L1256 WS-P - Super White Lightening
M2050X-PS - Propellant X
98mm:
L2500ST-PS - Super Thunder
M4500ST-PS - Super Thunder
M6000ST-PS - Super Thunder
Wildman doesn't carry the new L1940X, but I saw on another thread that it also requires the SS disc.
So, it appears that at least Super White Lightening, Propellant X, Super Thunder need the SS discs.
I plan to fly at least 3 of the motors listed above this weekend, so will have to assemble at least one at the field since I only have one of the 75mm discs.