Its a viper, surge, goldie locks, gator, etc. All depends how its branded on a parts website, anyone who builds clutches and works on them can get you the right parts as well without guessing as well since there isn't a unified parts codification like there is with the bully or smc brands due to individual branding/labeling.
You want to measure the under side of the spring retainer to the top of the activator plate for the .380 measurement, not the overall height. The viper springs have a decent gap at the end of the coil to put a mic in, might just have to rotate them to do so before tightening them down.
These clutches work very well, just need it set properly.