Description: 4.8, 5.3 & 6.0L. 8.1L gas, 6.6L turbo diesel. 4.3L. CREW CAB. upper code: orange. 2WD. upper position 3. 4WD. upper position 3. Standard cab. upper. Extended cab. upper. Helps dampen the vibrations between your vehicle's body and frame connection Made of shock absorbing material This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors Collision parts are designed to help promote proper and safe repair