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You might need to use some pressure to constrict the shock as it falls into place, and you might need a help to help lift the suspension back up to reinstall the bolts in the correct positions. It can be kind of a balancing act, so it helps to have another set of hands. Screw on the nuts hand tight. Reattach it and screw the bolts back on hand-tight. Replace the shock tower nuts you removed at the beginning of the process, probably in the trunk of the vehicle. Before you go tightening everything back down, recheck the specifications for torque to be sure everything's secure. Most of the shocks should wear out at the same time, so if you're going to do one, you're probably going to end up doing them all. Do in following the same steps and then put the wheels back on and tighten the lug nuts to finish the job.
Fit the new shock back onto the suspension control arm. If needed, you may once again affix the anti-roll bar if you removed it earlier. Check your torque specs in the service manual. Repeat the steps to replace the other 3 shock absorbers, if necessary.