I'm getting ready to install a ring mount. The 20 manual, dated 10/91, has excellent instructions starting on pg 14-70. It shows which leg goes where etc. What it doesn't tell me is height. I have 3 sets of holes on the back of the cab for the U bolts. If I use the lowest/highest, which are 17" apart, it leaves the arms of the mounts only 2" or so above the cab top. If I use the middle/top, which are 10" apart, it will let me set the mount 7" higher but I loose strength by having the U bolts closer together. I know I need the reinforcing plate. I did a search and found pictures from 2 different installs but they don't show me the height or which set of U bolt holes they used. If anyone can look at their mount and give me some insight it would be appreciated.