Designed to replace the lower OEM rubber pads. Use them to adjust the ride height on the rear of your e30, e36 318ti or z3. Each set includes 3 pairs of pads of varying thickness (3.5mm, 5mm & 6mm) and two aluminum centering rings. Use the thinnest pad for the lowest setting, or stack all 3 to raise the rear almost 15mm. We use these to corner balance our spec e30 race cars. Fitment: E30, E36 318ti & Z3Includes: 6 spring pads and 2 aluminum centering rings. *May have Fitment issues on '97 Z3.