Message Our spacers are made to fit the contour of the bottom bracket... The flat part of our spacer sits against the rubber bump stops of the bushings.....If you drive your car hard with out spacers you will notice marks on the body above the factory bushing.....This is because the bushing travels all the way to the top of the body in its normal travel.....By placing spacers only of the bottom and sucking the body down you are still holding the bushing tight in its normal travel, But you are also lowering the center of gravity another benefit for better handling. It lowers the body about 1/4" in the rear which levels the body because they sit slightly higher in the back stock.