So I was replacing a knock sensor a while back, and somehow (I derped) manage to have a extra bolt left over... Normally it wouldn't bother too much, but it's pretty unique bolt. See pic. Any chance any know where it goes?

If it helps, I had to remove the intake box, the upper intake manifold with throttle body, the lower intake manifold runners, fuel rail with injectors, and some random brackets to get access to bolts.

 

Timing belt cover bolt. Check the front pass corner- I think I had to take one out to remove something when I did my knock sensor.