Question about window switches for my '85 Cabrio. The parts manual lists two different switches for the Front and Rear windows. Looking at them, they are physically the same except the front window switch has all 5 pins, and the rear window switch only has 4 pins although they have the same connector. I'm curious if the 5 pin ones will work in the rear, since they are more readily available both new and as reproductions. Why do the rear units only use 4 of the pins? Thanks!