don't cut it off! that's the end of the rocker. look at your 2nd and 3rd pics carefully. the outer wheelhouse will get welded to the tabs to the left of it that are folded to the inside of the rocker and to the backside of that tab at the end. the rear lower edge of the quarter will come down and be welded to the skinny flange that's just past the hole in the rocker. it looks like it got bent in a little during shipping, that last section should continue straight--you need to carefully tweak back out so you don't crease it.
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