I need a windshield frame for my 1936 Cabriolet. I know the top half of the frame has a different contour (flat top) compared to the Coupe windshield. What about the bottom half? I assume there might be a difference in the mounting holes since the Cabriolet windshield is fixed and does not crank out. But could a coupe lower half be made to work, is it the same shape? I have a good original top half.