Need a trailer plug

[speedshifter]

I got my Yukon and one of the problems is that the brake lights dont work.  The prev owner attempted to tap into the brake light wiring when GM had a factory harness wire tied to the frame-rail waiting for installation!!!  The guy at the dealer said that all the trucks come wired for it, and they only hook it up when its ordered with a towing package.

 

So anyway I need a female plug to mount on my truck for the trailer lights.  I use both the flat-4 and round-4 connectors on my trailers.  I have seen plugs that have a combo of flat-4 and round-6 connectors, so I was wondering if anybody makes a connector that has a combo of both the flat-4 and round-4 style plugs.  This way I don't have to carry around an adapter for either style.

 

Thanks for the help!!!