Was that coilspring?
Weird not giving advice!
http://www.dfaulknersprings.com/index.htm
I am having some made to replace the utter s**t KW springs, which are apparently made of jelly.
That website is shocking and looks very unprofessional.
I've been considering this route for a long time as I love the way the CUP chassic handles, but would like to see it an 1" lower. tried eibach sportlines that gave a nice drop but just felt too crashy over 'B' roads and felt it gave less feedback over front end grip so took them off.