Bought the Lexus harness through a local tow hitch company as Lexus wouldn't sell it to me direct; they only sell it with the towbar. Cost was $200, but I wanted Lexus wiring to plug in, as opposed to the after market harnesses, which all seem to connect/splice into other wires. Anyway, neither of the connectors shown in my photo are used for the tow harness wiring. There are a number of connectors, the first of which is above the two shown in the photo. The instructions are quite clear and the installation is working fine. Thanks again for the advice.