Thanks for the info. OT, once again good leads on parts.
For anyone looking for replacing or adding wipers, check out the wiper kit on "itsasnapwireandcable". You can mount the motor up to six feet away from the blades, which makes it very handy for mounting above the windshield without anything protruding into the cab area. Also has a delay and park feature.
I will hang on from purchasing anything as I have a funny feeling the the old trucker will be coming up with a few more choices.