Leftover torx bolt
 

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A couple of months ago I serviced my 2008 A4 Quattro. I replaced the timing belt, water pump and thermostat. Once finished, I found (4) torx bolts left in the dish :(

Everything is running perfectly. However, I get an obnoxious rattle around 3k rpm (seems like the engine has to be warm)

I'm assuming the issue is related. Does anybody have any suggestions? Or know of a good parts diagram that will tell me where I might find these specific torx bolts?

Wheel liner?

Belt housing cover?