I got a set of morettes that dont have a wiring harness

anyways, there is a long wire (actually 2 wires) coming out if the drivers side unit that are supposed to attatch to the passenger side unit. However, I dont know where they attatch too. The ends sticking out are a female and male flat plug thingy (sorry, I dont know technical terms). thanks everyone.

ps: I have searched and all the diagrams I have found just say that the wires connect, but do not say exactly where