This Boom Fold Cylinder from Miller Industries is used on the UnderliftAssembly of Century and Challenger Wreckers. Seal Kit is 12-0304244 is commonly used with this cylinder. Please seethe features below for a list of wreckers and see the brochure tab forbreakdowns. Boom Fold Cylinder Related Items: Seal Kit 12-0304244 Fits: Century 1624 (04/2002 – Current) Century 3224T (06/1996 – Current) Century 4024T T2 (01/1999 – Current) Challenger CH-16 (07/1996 – Current) Challenger CH-20T / T2 (07/1996 – Current)