An ascMcLaren forum for 84-86 Capri and 87-90 Mustang based cars modified by Automotive Speciality Corporation, a Division of American Sunroof Corporation. (no affiliation)
Well, I've seen a few "parts" mclarens come up for sale the last few years, you'll just have to do some investigation to find them. I haven't seen too many if any people that needed a new frame. What happened to yours?