H3T Wiring Harness Question.

[StarsnBars]

Hi all,, I'm putting on a aftermarket trailer hitch on my 09 H3T.(rear). Got the hitch, no problem, but I want to get the right T-connector. I have located this one,, http://www.amazon.com/Curt-55384-Man.../dp/B0009FJ38Q,,,, looks like it will work, but I've had alot of sites tell me things will fit the H3T from a H3. Service dept, at my local dealership couldnt really give me a answer. Are there and G.M. peeps or techies out there that conferm this. Or is there a serial number for a O.E. rear harness (trailer package) that would be better? Dont really need the harness till spring so its not a rush. Cant seem to Google the right answers,, Thanks