It will have to be OEM glass.
I know the original post was about a 79 Cobra, this question is for my 70 that at some point I would like to replace the glass as after 40+ years they have lots of small scratches.
Charles, there are a couple companies out there (example PS glass)that will restamp glass with the correct Carlite and date stamp. Will the judges be able to tell it is not OEM and deduct points?
1967 Mustang Sport Sprint Coupe 289 Auto, AC, PS, CA Smog, Built April 1967 in San Jose. Unrestored, one family owned and in my possession since 1980.
1970 Mustang Mach 1 428SCJ Auto, PS, PDB, medium bright blue metallic with White Shaker, built Sept 12, 69 in Metuchen