Shock extensions are designed to keep the shock as vertical as possible when lowering the rear of your vehicle. Contrary to popular belief, they're not designed to extend the length between the mounting points.
TeraFlex 2-2.5" Lift Rear Shock Extension Kit For Jeep Gladiator JT
Rear Shock Extension Bracket 2" 3" Lift Block For Chevy Suburban Silverado 1500
Rear Shock Extension for GMC Sierra C1500 88-98 Upper Mount Steel Lowering Kit
Lowering Rear Shock Extension for Ford F150 1997-2003 Steel 5mm Std Ext
Rear Shock Extenders Brackets 4" for Ford F150 F250 F350 2WD & 4WD 1980-2016
Rear Shock Relocation Brackets Kit For 1963-1972 Chevy C10 C20 GMC C15 Pickup