Yes that is the vacuum pump and this is becoming a bit more common now that these engine are getting older. Below is a good video showing you the o ring that needs replacing, and then some links to the o ring you need.
Single o ring: Vacuum Pump O Ring for Audi A3 A4 Volkswagen Eos Jetta Passat 06D145117 | eBay
Full o ring and seal kit: RKX 2.0T Vacuum Pump Reseal/Rebuild Kit for Volkswagen & Audi VW 2.0 T MKv, B6, 8P, B7 gasket 2.0T LIFETIME kit: Automotive: Amazon.com.au
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