Try Robbins. They are a manufacturer. Look at https://robbinsautotop.com/ford-mustang-1967-70-convertible-top-folding-glass-window-section-gl304

They claim, "Non-Original Clear Folding Glass Window Assembly fits with 7202 Top Only. With zipper and Robbins Flex-Hinge, U. S. Patent 4,799,727"

The Robbins patent: https://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=24&f=G&l=50&co1=AND&d=PTXT&s1=4,799,727&OS=4,799,727&RS=4,799,727

And: https://pdfpiw.uspto.gov/.piw?Docid=04799727&homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect1%3DPTO2%2526Sect2%3DHITOFF%2526p%3D1%2526u%3D%25252Fnetahtml%25252FPTO%25252Fsearch-bool.html%2526r%3D24%2526f%3DG%2526l%3D50%2526co1%3DAND%2526d%3DPTXT%2526s1%3D4,799,727%2526OS%3D4,799,727%2526RS%3D4,799,727&PageNum=&Rtype=&SectionNum=&idkey=NONE&Input=View+first+page