You have the exact same problem as Weeds who drove in a rain storm in Kansas City last weekend. I also installed the electric motor, using the original arms. I drilled a new hole half an inch short of where the long arm (right side) goes into the wiper. I carefully pounded back the peined end and moved it to the new hole. (The problem, in my opinion is the electric wiper unit, if you hold it beside the original vacuum unit, you will see that the arms are a bit longer)
