I just replaced the upper timing cover seal and water pump on my 1995 E320. The problem is that I have an extra bolt left over and I can't figure out where it came from. It's a 13 mm bolt that looks similar to the ones used to bolt the the upper timing cover. This is not characteristic of my work and it has me worried.

All 6 bolts are present on the timing cover.
All 4 bolts are present on the water pump mount.
Both bolts are present on the water outlet on the timing cover front.
Both bolts are present on the air pump mount.
Both bolts are present on the power steering mount.

So where does it go?

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95 E320 Cabriolet, 169K