Dual bearing idler pulley for use with a 10 rib supercharger belt. Offered in Black, Silver, Red, Purple or Blue Front Spacer.  The external portion of the pulley that contacts the belt is only offered in black.  Vehicles with oversized crank pulleys require 3.25 inch Dual Bearing Supercharger Idler Pulley. NOT COMPATIBLE WITH 2022 or newer HELLCATS.  Please contact us directly if you have a 2022 Hellcat at [email protected].    Installation torque spec:  Idler Pulley Bolts: 29Nm or 21Ftlbs