Our 1964-72 Pontiac GTO, LeMans and Tempest, Black Out Series POL or Wilwood power brake conversionmounts in the factorylocation. Greatly increases your stopping performance while making it easier on the driver. This kit includesa Black Outadjustable prop valve taking all the guess work out of the installation. Also makes going to rear disc brakes a snap without having to replace the existing valve found on most other kits. These components are a must when upgrading to disc brakes and come completely assembled, ready to install.