Now I could go to their web site to find out but I'd rather ask you all this because you guys are more informative than any product web site will ever be. I've read a whole lot in this forum about suspension etc. now because I'm not too familiar with GC (I've always went with eibach on all my cars) because I never paid attention to GC's can someone tell me exactly what they are as to function, let me be more specific because I'm not totally ignorant of their purpose I know that, but here's what I don't know, do they replace both strut and spring? are they an all in one product? or do you still need to buy springs, ya get what I'm saying or asking excuse me.