These sources have these bulbs
From an "Original" post on the TT forum on Audiworld, now brought to you here, unedited, except live links added, and a wonderful picture of the actual bulb.
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VW Parts $9.93
Candlepower.com carries the Narva number.
Audi specs the long life versions of these bulbs.
The front parking lamp uses a H6W (ECE nomenclature) bulb. This is a 12V, 6W halogen bulb with a BAX9S base. Manufacturer numbers include Osram 64132, Philips 12357, Philips 12357LL (long life), Narva 68161, and Narva 68162 (long life). The VW/Audi p/n is N 104 455 02.
The front turn signal lamp uses an H21W bulb. This is a 12V, 21W bulb with a BAY9S base. Manufacturer numbers include Osram 64132, Philips 12357, Philips 12357LL, Narva 68161, Narva 68162 (LL). VW/Audi N 104 456 01.