About this item: Kit configured to re-seal stock or aftermarket pipe with proper new swivel hook pipe springs, "O" Rings, and Hi-temp silencer to pipe coupler. If unsure, please check coupler image #2 for measurements and OEM part number for reference. Replaces factory equipment with exact fit quality parts. Kit comes complete with what you see. Designed to fit YZ250/YZ250X all 2001 to current models. Complete set, nothing else needed to seal up your two stroke exhaust pipe. Product Description: Expansion Chamber Seal kit for YAMAHA YZ 250 2-Stroke YZ250 and YZ250X Dirtbikes Motorcycles. Kit replaces old factory parts with fresh springs, o-ring seals, and pipe to silencer coupler. This kit is for: YAMAHA YZ 250 2-Stroke YZ250 and YZ250X Dirtbikes Only.