Thanks again for the Peter White info, but yes, I already have the answer from them.

BTW, from their website you:
"Most of the taillights we sell have screw posts for the wiring. The double strand wire we sell has connectors on one end only, for attaching to the bottom of the headlight. And you then use the bare wire ends for the taillight attachment. But the Toplight Flat Plus has only male connectors, meaning you'll need a wire that has female connectors at both ends. This doesn't exist all made up, so you'll need to make your own."

This is actually incorrect. The Toplight Flat Plus comes with a T-shaped plug unit. There's a post that locates into a hole in the back of the unit and then the rest of the plug swings down--thread the wires in from the bottom, bend them over toward the back, and then the plug unit snaps into the light connecting the wires securely to the connectors. So this unit can be used with any wire ending in bare or stripped ends. Also, although it did not come with wire, the Lumotec IQ Fly comes with wire to connect to a tail light. FYI.