Billet engine mount fits 2010 and up Yamaha YZ450fi and 2013 and up YZ250fi engines. choice of clamps to fit either 1-1/8" or 1-1/4" tube chassis. Clamps fit QRC frame rail spacing: 2.75” on center for 1-1/4” frame. 2.85” on center for 1-1/8” frame.(sold seperatly)