you or the shop installed it. Hell, the shop installed mine with the 8" springs.... Essentially wasting my $300 for install considering I re-installed them all again once I/tt.net members/ground control finally figured out they were an inch to long. And then re-installing them again when I put the rear arms on. LOL, I do things totally ass backwards. One day I'll learn. BTW, I went straight through Ground Control regarding my bad springs. NOt through the distributor from whom the poriginal purchase was made from. I guess it was Todd if I recall correctly, that was working with me from GC. He sent my springs from CA to NC overnight and charged my credit card($80 for both 7" rears). I then sent him my 8" springs once I installed the new ones. ONce he recieved them 2 days later, he credited my account. ALthough I did have to deal with shipping, I was pleasantly pleased with their service.