Challenger Lifts 10315 Two Post Stack Adapter KitStack Adapter Kit for 10,000 and 12,000 lb. two post automotive and truck lifts. Drop in style stack adapters help reach pickup points on vehicles with running boards or side steps. Simply take out the screw pad, drop in the stack adapter extension and replace screw pad to reach lifting points. Stack Adapter Extension Kit includes four 3" Stack Extensions, two 6" Stack Extensions & two Organizer Racks with hardware. Organizer racks mount to automotive