I have a 67 el camino that was too high in the rear when I bought it, so I bought 2" lowering springs thinking that would be about right,WRONG, after putting the springs in it was 5" lower at the rear bumper which is too low, so now I am wondering if the springs I took out were stock, they are 15" tall sitting on the floor,does anybody have any stock springs out they could give me a measurement?

Who makes the new springs you installed?

Classic performance products,I even double-checked to make sure I ordered the right springs.