Got to work yesterday and my wife called to make sure I made it in OK. Seems she found a bolt in the driveway where my car was parked. Took a look at it when I got home - it is about 5 inches in length with threads on the last inch or so with I think a 13mm head. Seems to match the look of all of the other bolts under the hood, but I and my mechanic can't find any missing bolts. Only other source he mentioned was possibly the timing belt cover, but in order to see it, he has to remove the wheel. All of his lifts were occupied when I stopped by, so I will have to stop by his shop at another time. Can anyone tell me or guess where this bolt may have come from?

Thanx.

Keith