From time to time people ask me where to get this. Up to now it's been "Sorry, donno". Now it's available in good heavy-duty quality, mis-listed as a "headlight switch"—without a photo, so here's that image:
I recently ordered one of these and it did not fit my 71 Duster. So I returned it. I then found this thread and reordered this same product. I know that is ten ways of dumb. But I did not see the white plastic part on the top of the connector