Fits 2003 to current 24 Valve 5.9L & 6.7L Cummins Common Rail engine. Includes billet gear housing cover and hardware. Billet gear housing to allow installation of P-Pump or Sigma injection pump. Also includes auxiliary drive location to mount aftermarket fuel pump (front cover mounted) and water injection pump (rear housing mounted) or pre-common rail vacuum pump and power steering pump combination (rear housing mounted), or combination of. O-ring seal to block and o-ring seal for gear housing cover. Has 12 Valve style aux drive. NOTE: Unit available in varied configurations. Cover shown in photo features optional over sized cover allowing access to and removal of injection pump gear through cover.