The plastic rectangle is so the upper control arm has a soft place to rest against when your suspension is at full extension or it would hit the side of the strut spring. Both of these plastic parts and their hose clamps mount in the same way on their strut (driver side or passenger side).
The bump stop goes on the lower rear spring perch. Before installing the new spring, you will have to mark the center of this perch and drill a hole using a 90 degree drill motor and the proper sized drill bit. Then place a piece of tape (I used electrical tape) around the threaded shaft of the bump stop and hang one from the inside of each new spring, use your bottle jack to widen the distance between the spring perches and install the new spring.
Now you will be able to remove the tape from the bump stop and it will already be on the inside of the spring, ready to be lowered into place in the hole you previously drilled.
Before you start installation if the lift, you will need your original jeep bottle jack and a suitable floor jack. I just installed my Frankenlift over the Labor Day weekend and the front end will require the most patients to install. I have a document I made outlining the steps I took to install mine. If you would like a copy before you start please e-mail me at
Wasatch15@aol.com and I'd be happy to send you a copy.
P.S. Before you start taking things apart on the front end, carefully and clearly, mark the position of all four lower control arm alignment bolt settings as you will be removing these to get the lower bolt of the clevis connected to the lower control arm. I also have a list of the correct torque values for all the bolts if you need them.
Be careful during the install,
Ron