There are some visors that are model specific. fit certain years, bodies , others were universal, one I have has a 6 in wide stainless center section and the side pieces slide into it, the mounting brackets have slots and a few holes. Build your own? Check out the metal working sites Metalmeet. all metal shapers etc , David gardiner in england has built a lot of things with simple metal tools, also check out the eBook here on HR, the scratch built hotrod. Cboy has lot of good info.