That would be the one, if you have something plugged in there you are already wired for cargo lights. Here's some pics from mine I just took. I did mine 2 weeks ago.
I did the same thing, lol. If you are looking at the plug that you pulled and is to the left, the plug you need is all the way on the right.
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Can you take a little more straight on shot of the mat near the gas pedal? I want these mats but am afraid of the salt here in Wisconsin getting past that area.