it was some online dealer on hondatech, there are a couple of websites that have them too, just search. with the damping force i either turn it all the way to hard or all the way to soft, soft makes the ride feel much smoother and hard makes me feel like im in a race car . my gsr is slammed, and i have had them for over a year now, no problems what so ever with the coilovers, and i still have room to drop more if i wanted to.