thanx for the reply, mbtjc
I had purchased the units prior to searching the forums, and gave myself a bit if a fright when I did. I had visions of a sunday afternoon with the lady's sl half-a-part, with no going forward or back, and various parts hanging in the breeze. That would be a bump in the ol' marriage. Again thanx. With a bit of luck, one of the other members will know the proper connection for the plug assy.
A mercedes is an inanimate object and therefore must respond to logic and reason.