I've been after a dipstick for a while, I've posted on various threads but no joy.
I was looking for a dipstick aswell and couldn't find one anywhere!
Found the Neuspeed one if you've not already seen it from Neuspeed or AWESOME.
http://www.neuspeed-europe.com/product.php?xProd=244&xSec=536
http://www.awesome-gti.co.uk/product.php?xProd=6740&xSec=349
http://www.seatcupra.net/index.php?option=com_content&task=view&id=19&Itemid=6