It is difficult to see without peeling the fender liner back but that lower housing bolt should be the only 10mm bolt in that area.
BTW, Do your projectors protrude from the rear side of the housing?
I did take the liner off and shined a flashlight under there.
The only bolt I could see is one attached to a square/cube like looking bracket the same color as my truck ... but I couldn't make out if that's where the headlight tab was attached to or if it was something else.