Price is per part (quantity of 1) Compatibility: 17” OZ 35 hole / right over 13.5” bore (Futura, Mito, etc). These parts are to convert your 17” OZ up to 18” diameter. Inner barrels will also need to be purchased when step converting up to 18”. Material: 6061-T6 Forged Aluminum Finish: Polish Condition: Brand New / Aftermarket Replacement ...