i am having trouble finding a wind shield and back glass for my 66.

Have you tried your local window shop? One here quoted me about $120 for a new windshield, AND installed for my 67.

I just had a windshield installed in my 66 rag top for 262$ canadian, I have seen them in the cars catoloug for like 188

Just had one installed at safelite... Most winodow shops will not come out ans install though