Installation procedure will be similar for all cars.
1) Safely put the rear of the vehicle on jack stands
2) Place a jack under the rear trailing arm to keep the suspension in place
3) Remove the lower shock bolt
4) Place the rear tie down on the inside of the shock and reinstall the lower shock bolt
5) Torque to 57 ft-lbs
We recommend always using a little blue Loctite make sure nothing on your e30 gets loose! This is the version we recommend: https://amzn.to/3MWIUlO