So now that its on the frame and somewhat in place its time to get the one mount done. Where the mount bolts to the tub there are actually 2 holes in the insert one being threaded and the other blank and the mounts as they sat landed right inbetween them. I had a choice to make a new mount or see if I can tap the inner hole to 1/2" and cut down the mount. Well the insert tapped perfectly and cut the mounts(one shown).