Next order of business was tackling the passenger side cab bracket. This install was pretty straightforward. The bolts for the cab bracket are already installed. You just need to remove them, install your bracket, and replace/tighten the bolts and you're done.
One thing you need to pay attention to is to tuck your cab bracket under the corner of the dash plate. You may need to use a prybar to open the space up so you can slide the bracket into place. It can be a little tricky lining up the two halves of the cab bracket to the hole. Just use a screw driver to recenter everything, then install your bolt loosely. Get all your bolts into place and make sure your bracket is squared up before getting too crazy on tightening everything down
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Also loosely install the three big bolts on the outside of the mount.
Pics:
1-Predrilled holes for the missing "L" shaped support bracket
2-Two halves of the passenger side cab bracket. Notice the 5 holes in the middle. Those holes mount to the "L" shaped bracket. This is the only difference between the M35A2/M809 series truck's brackets.
3-The factory installed bracket bolts removed
4-The small space where the bracket needs to be tucked under the dash plate.
5-A little prying helped open up the void
6-Install each half separately. Just tap into place with a rubber mallet
7-Centering the hole with a tool that was nearby
8-Bracket installed and ready to go