1929 Model A Coupe Top wood question

I am replacing the missing wood in the roof of a 1929 Model A Standard Coupe. I am using all new wood with the exception of the rear bow that came out of another 1929 Model A Coupe, a leatherback (Not a Sport Coupe). The problem is the large rear bow that runs from side to side above the quarter windows is about 3/4 of an inch short. Does anyone know if the leatherback was a bit narrower than the standard coupe.