My first thought was, that it had to be Nr.2 in "bungs/body" 1KO 899 185 | 40 mm | 4 pcs, but they do not have the right posision.
WHT007060 "end cap" may fit, but acording to the applicability list, they first came in use from 2010 in the VAG system, and A2 is not included.
I still have 3 bungs, I will look for a part number on them and report it here.
No part number printed, only TRW. ⌀50 mm.Just plastic caps, and not rubber pads.
Identical to WHT007060.
This part also make a perfect fit for the hole in the undertray!