After I installed the cage I realized that the horizontal cage bar in he back went right across the mounting screws for the rear aluminum panels. The problem is that I was putting off some backing plating that I needed to install until after the cage was installed, so with this new problem I needed to take care of this before I bolt the cage down to the floor.
I had to take out all of the cage mounting bolts and lift the back of the cage up about 2 1/2" to access the mounting screws on the rear panels.
I used some 1/8" cold rolled steel plate to be used as backing plates for some tube flares that I will be building. Once they were made, I painted them and then sealed them to the inside of the body using pop rivets to hold the plates firmly in place.

It wasn't much fun drilling thru my rear fenders right into the new paint! Once I build the flares the rivets will be removed and replaced with mounting bolts.