OEM Part #61-1287-003.00" OD x 11.38" O/A Lg (retracted)Includes cylinder and collarUses Hydraulic fluid (RPI Part #RPF449)Fits: Between baseplate and upper structure of chairModel(s) This Part Fits: Cascade 1040, Decade 1010, Decade 1011, Decade 1015, Decade 1020, Decade 1021, Performer III