Tools you will need
5mm allen wrench to install button head bolts
10mm socket or wrench to hold nuts while screwing in bolts
10mm socket or fixed wrench to remove factory bolt at top
Spacers
There are 2 connections at the bottom of the panel that took some experimentation during the install. The back uses the 2 inch (approx 50mm) spacer.
The front uses the 3.25 inch (approx 80mm) spacer.
Installation
Remove the three bolts, top clothes hanger and two lower bolt locations in the truck interior.
Screw all the nuts on loosely on the metal panels. Then, re-attach the top bolt through the metal bracket to support it to the truck. Next, install the two lower bolts into the frame. The back uses the 2 inch (approx 50mm) spacer.
The front uses the 3.25 inch (approx 80mm) spacer.
Finally, shift the brackets and bolts to their final location and tighten them.
Final thoughts, the panel is well made, and is a good thickness for my needs. The back part of the bent plate rubs against the interior of the truck. The whole panel sits down about 1.75 inches (approx 45mm) from the top of the interior ceiling. The bottom of the panel is 0.75 inches (approx 20mm) from the wheel well of the truck.
This install was on a 2017 T4R SR5 model with third row.