Anyone recognize this bolt? It was in my driveway under the car. I have coil suspension so couldn't jack it up and take a good look underneath and see where it fell from. I get the impression it's one of the bolts holding up the battery. Appears to be made of aluminum and has part numbers stamped on the head (AK and AL9). The end is sheared off but not cleanly, like it had a fatigue crack so I don't know how long it is supposed to be. Width is about 6 mm. The car is a December 2014 S85 so probably shouldn't be losing parts yet.