Eliminate flex, control wheel hop and body roll with these heavy-duty lower rear control arms. The fixed model features urethane bushings and sway bar mounts, ideal for factory suspensions. The weight jacker model features adjustable spring cups. This allows the driver to lower the rear end of the car by a full 1-inch and still use stock springs or raise back of car by as much as 2-inches from stock ride height. This is an excellent feature for lowered cars that need to be raised for tire clearance, like slicks. Also great for road racecars requiring adjustability at each corner of vehicle. Each set includes a pair of precision welded lower control arms, all necessary hardware and a durable powder coated finish. Installation takes 3-4 hours using basic hand tools. Each system is backed by a limited 90-day warranty