Hi, possibly the wrong place for this query, but I have an A6 2.5 tdi v6, so here goes...

My friendly mechanic told me at the last oil change that some of the screws that hold on the bottom engine cover are missing...they're "special" apparently. Anyone any idea where to get replacements (if only Audi, can a kind soul with a parts catalogue help with a part number?). its a 1999 MY btw.

best
Jim