Ader Add On Weight 2.5 Lbs or 5 Lbs To Choose from. (one of 2.5lb+5lb) Ader durable 2.5lb and 5lb add on adapter weights work on most machines as long as the 2 guide rods are 5″ apart from center to center. Works with most of Marcy, Body Craft, Body Solid, Multi Sports and Master Fitness weight stack system.