I am in the process of changing my cab from a 3 window (1953 3600) to a 5 window (1952 3100) and have encountered a puzzling hitch. I took the after marked electric wiper system out of the 1953 and when going to install in the 1952 the length of the wiper connecting rods to the wiper motor is about 6" short of matching the holes in the 1952 cab. Anyone know if the spacing of the wiper holes in the cabs changed?