METCO Auxiliary Idler Kit for 2007-14 Shelby GT500 Fits OEM-style Eaton and Whipple Superchargers Will not fit with Whipple 4.0L supercharger The Metco Motorsports Auxiliary Idler Kit for the Shelby GT500 is cleverly engineered to be a simple bolt on and to be the ultimate solution to belt slippage. The kit consists of a heavy-duty, precision-machined aluminum plate that offers three locations for the included 90mm double-bearing idler pulley. The plate bolts to existing bolt bosses on the vehicle and locates the pulley just to the left of the supercharger pulley, maximizing belt wrap and eliminating slippage. No modifications to the vehicle are necessary. The ider assembly ships fully assembled, and the required fasteners and illustrated installation instructions. When this kit is installed Metco's popular MSP2.60 or MSP2.40 supercharger pulley, the original belt can be re-used.