Bolts that hold nose to underbody?
 

2003 A6 2.7T - there are 3 holes that some sort of bolt or screw go and hold the nose up under the enginer near the oil pan skid plate. The dealer sold me 3 pop screws but these holes are threaded. I have tried every screw and bolt I could find at home, work and at the hardware store with no luck. Any place on the web I could figure out what size bolt or screw belongs there?