What I ended up doing to get the back up lights to work involved many steps, but I found some nails 2.2 mm in diameter which fit into the transmission switch, and hooked them up to my wiring harness. That is far from a satisfactory solution but it worked. Also I had a problem with my back light housing but eventually I got it all to work.
If anyone has the correct plug, I'd still love to have one. Thanks.