Supreme Suspensions - Chevy Silverado 2500HD 3500HD Steel Shock Extension Kit 4x2 4x4 PRO FITMENT: 2011 - 2018 Chevrolet SIlverado 2500HD and 3500HD 2WD 4WD. ONLY Fits 8-Lug Models TECHNICAL NOTES: Maintains factory ride quality. For front stock shocks. INSTALLATION: Installation is easy and takes between 1 - 2 hours. No special tools are required. CONTENTS: 2x High-Strength Carbon Steel Shock Extenders, Installation Hardware, Installation Instructions and Supreme Suspensions Pro Pack. BENEFITS: Reduces over extending pistons so that your factory shocks can be reused without compromising ride quality. *A<span class="a-text-italic">n alignment is recommended after install.</span> (2x) Carbon Steel Shock Extenders Installation Hardware Installation Instructions Supreme Suspensions Pro Pack