Determine the correct spacer for your lifted vehicle
Lift spacers can be used with most Drive-Rite Semi Air Kits. The spacer needs to be the same length as the amount of lift applied to the axle on which the Air Spring is being installed.
Note that a six inch lift does not mean you need a six inch spacer!
Most six inch lifts only have four inches of lift in the rear to level out the vehicle. This holds true for the shorter lift kits as well.