I've done a search and found no 100% conclusive answer...
What strut size will my 2009, 8P, 1.9TDI Audi A3 be?
It's either 50 or 55mm but I have no idea...
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I am sure it is 50mm on the 1.9 TDI.
Check here though
front strut diameter - uk-mkivs
http://www.facebook.com/profile.php?id=504930866 - Thats ME!!!!!!!
Cheers man! I'm gonna give Audi a ring to be on the safe side too.