Does anyone know the difference between a 67/68 and a 69 wiper transmission? I know for the repros, there's a different part number. But, I have no idea what the difference is. The reason I'm asking, I bought one of the repros right after they came out. I'm just recently getting my 67 on the road and after I installed the DSE wiper motor, only the drivers side works. Seems like the passenger side is attempting to work, but just twitches a little. So, I'm going to be looking for another and I was wondering what the difference is.