The U-bolt spring plate has a similar hole which must be aligned with the bottom nut of the center pin, and we found a few nuts that were too big to fit. If this is the case with your lift, enlarge the hole to allow the nut to fit through, then install the plate. The nuts on the U-bolts should be tightened evenly until they're snug and nothing moves around. Make sure the shock pin on the plate points in the right direction for mounting the shock.
Once the Rancho RS 9000 shocks are installed, the adjustable knob should face rearward for protection from rocks and road rash. The boots on our shocks were left off since we've found that they usually fill up with water and mud, which will eventually ruin the seals and the shock. The extra length of the U-bolts sticking out past the nuts should be trimmed to prevent them from hanging up on rocks and getting bashed. After the first 100 miles or so, all attaching hardware should be retightened and checked for safety and security.