RockJock's Jeep JT Gladiator Mojave Rear Upper Bump Stop Spacers are designed for use with with their 1 1/2 inch JT Mojave Suspension System. These spacers allow you to retain your Mojave's factory installed air-bumps when installing the 1 1/2 inch lift. Simply pull your soft factory jounce bumpers out of the frame cup, bolt these spacers in place and then push your factory jounce bumpers back into the bottoms of the spacers! Spacers are CNC machined 6061-T6 aluminum, are clear anodized and include all necessary hardware.