Must purchase the part BC250221018 for models through 2010.Our part number information is included with the Chain Guide for easy reference.Bolts on 2011-14 Gas Gas motorcycles stock mounting bracket.Only TMD’s part accepts wide O-ring chains and oversize sprockets with no interferance.TMD is inventor and worldwide patent holder of the first solid body chain guide design. Don’t be fooled by imitations.Our patented solid body design features our exclusive RMS (Return Memory System) plastic formula and impact resistant plastic.Used exclusively by the USA Factory and overseas Gas-Gas Factory Race Team.The only guide with 100% UV and perfect OE color match in black and red.The First and only all plastic rear chain guide to win multiple Off Road championships for 11 straight record breaking years.