I have a stock '95 Thundercat 900 and am looking to improve trail performance through clutching. I recently purchased a D&D kit that was supposed to have a purple primary spring and a 62/554 helix. They don't make the purple spring anymore and sent a blue one in its place...but I don't think this an appropriate replacement. Does anyone have any recommendations on what spring to use? I am still using the factory yellow secondary spring in the 5th hole. Any help appreciated!