I might be missing something here , but I don't think that your switch makes a difference as to where your wiper motor parks the wiper blade . The photo of the wiper switch shown has two terminals and it just completes the circut , thats all . Can you reposition the wiper arm so that when the switch is off , the blade is parked ? Then it may have the wrong arc though . It is kind of hokey , but can you turn the switch off when the blade is at a certain position and it will then be stopped in the park position ? edit ; I think the parking feature of your wipers is built into the mechanism of the wiper motor , that would be a very tricky operation to change . The other option would be to rotate the motor , but yours probably doesn't rotate .