[wrndln]

What I did on my 28 special coupe, which is virtually the same as a 28/29 sports coupe, was use friction tape as an anti-squeak material. I used contact cement to hold it in place before fastening the wood in place. 3M caulk strips would also work well I would think. I have used 3M caulk strips in other places and it works well to seal the joints (and probably eliminate potential squeaking).
Rusty Nelson