The shock is gas pressurized, so you will need to compress it to get it in the lower mount. We used a long screwdriver to move it within the mount to align shock and mount. Re-use your existing lower shock-mount bolt. Don't overtighten the bolt, as this can bend the mount tabs. The rear shocks use a T-bar with two bolts on the upper mount, but are otherwise the same to install. In three hours, we had all four shocks swapped.