I sort of posted this last Thursday but I have more info now. While having some work done last week on the car, I decided to have a local shop install some 620 lb springs. My car has the Shelby 1" drop. After removing the drivers side spring and setting the new 620 lb in, there was about 2" of space between the top of the spring and the the two tabs at the top that hold the spring in place. I drove over to look and let the guy know that he needed to drop the car and it would compress enough to hold the spring in. He disagreed and basically said he did not want to be responsible for the spring popping out as I drove it away. Should I just take it somewhere else or is a 2" gap with no weight on the car normal for 620's? He also said I needed an insulator for the top since mine were basically gone on the old springs. Is the 1/4" or 1" poly or the rubber one the best choice for this?