Working today & Friday but can go out to the barn this weekend and take some photos for you. maybe some detailed measurements down the road.
I bought a 1927 Star coupe just for the wood patterns for my other coupe that's like yours. All the wood is excellent and great for patterns
The photos will determine if a 1927 and 1925 are comparable.
My 1928 Durant is at the restoration shop right now but I ran out of money and have to bring it home in about 3 Saturdays. If no one else has replied to you or gotten the information you need, when I get it home I can take pictures and measure etc for what you need. The restoration shop just rplaced all my wooden roof parts.