I have them in the shop, some where.It is a Deutsch connector. I don't think I have ever seen a pigtail for them, a kit is usually stocked by repair shops. And I don't know the sizes and generations of them. However, I see a easy way- this harness, probably the cheapest around, and cut them off and splice-
Now something else, if you cut the end off, and took it to a tractor repair place, or a Harley dealer, even some GM dealers, they could make 2 new wires with the ends installed, and put them into the connector housing.