I have two more questions. Is 1927 Ford Coupe door glass measurements the same as 1926 Ford Coupe door glass measurements? The thickness of the glass back then was thicker than replacement safety glass of today. So when replacing the channel who has the correct channel to accommodate the thinner glass?
At least according to my reprint of the March 15, 1927 Ford glass book, 1926 and 1927 door glass is the same, as is the quarter window glass and back window glass. Perhaps some members with original coupes can chime in on their observations and on a source for compatible glass channel.
I have used the model A channel kits on T's with good success. I also have heard discussions about glass thickness differences but I just measured 2 original plate glass windshields 1924 or '25. They were .252 and .245 thick. Then I measured 3 new glass windows and they measured .234, .235 and .239. I don't see why that would cause a problem with channel.
Interestingly to me that the supplier I used sold the channel separately in a standard length but now only sells the Model A kits. After they explained that to me they said "OK we will make up a kit and send it." If they have to make up the kit, why not just sell the channel? But it's their business.