Bob, When you refer to the mounting of the ram horn, this piece is riveted to the substructure in the cowl panel. If they have been replaced the location of the lower part of the windshield station can be problamatic.Also to close the gap between the top of the door and dash rail, make sure the gas tank is not to low and pushing out on the side cowl panels.These are some of the hardest parts to get to fit nice on any of the body style I have worked on. When you look at pictures of Marco's roadster you'll probably want to cry,because his so perfect. Don't feel to bad if you don't reach that level of perfection. Good luck, Frank