[montrosepatriot]

after browsing a GM parts catalog here's the part #s 4 the full convertible sheetmetal (the #s listed have been discontinued since the early 1980s and sadly no one offers the parts for rust repair - since the advent of the 3D printer new stamping dies could b manufactured 2 reproduce the parts needed 4 the conversion including the rocker boxs (a 73-77 rocker box can b lengthened for a 78-91 if spot welded in the same spot as the older 73-75 full convertible)

326995 outer windshield frame (73-75)
326996 inner windshield frame (73-75)
326997/326998 windshield frame cap (this might be spot welded inside the inner windshield frame) (73-75)
349360 roof front inboard mounting plate (3) (73-75)
337719/337720 door glass window guide (full convertible doors - has additional brkt)