I have a 2006 Mazda6 SI, just got new wheels and tires, but the REAR WHEELS were rubbing against my spacers after every dip in the road---so I need them in the Basically "raise" your back. I bought 4 of these spring locks (2 on each side) to distribute the pressure on the coils. fits pretty well. Let me add that I also bought a rubber grommet for the rear coils. The ride is a bit bumpy now as the bumps don't hit as hard, but it made sense; so that the rear wheels don't rub (status 03.01.21) I will update in a few months!