IRONTEK Power Steering Pumps are completely NEW with no refurbished components and no core is needed. The Internal components of each pump are designed to meet or exceed OEM standards and are ready to install. This high-quality replacement steering pump would be a guaranteed exact fit for the steering pump in your vehicles. This part may also be referred as: Power Steering Pump, Hydraulic Power Assist Pump All IRONTEK Power Steering Pumps are backed with 1-Year Warranty. Compatible with: 2005-07 Cadillac STS 4.6L 281Cu. In. V8 GAS DOHC Naturally Aspirated Supplied w/o Reservoir; Qty needed per vehicle: 1 2008-10 Cadillac STS 4.6L 281Cu. In. V8 GAS DOHC Naturally Aspirated W/o Active Steering; Supplied w/o Reservoir; Qty needed per vehicle: 1 2007 Cadillac STS 4.6L 4565CC 279Cu. In. V8 GAS DOHC Naturally Aspirated Supplied w/o Reservoir; Qty needed per vehicle: 1 2008-10 Cadillac STS 4.6L 4565CC 279Cu. In. V8 GAS DOHC Naturally Aspirated W/o Active Steering; Supplied w/o Reservoir; Qty needed per vehicle: 1 2006-08 Cadillac STS All Supplied w/o Reservoir; Qty needed per vehicle: 1 2009 Cadillac STS All W/o Active Steering; Supplied w/o Reservoir; Qty needed per vehicle: 1