The gateway you need to prevent the power drain issue is the Volkswagen (Audi/Seat) one, and should look like the one in My-GTI's link:
Upgrading 2nd generation radios (RCD 300, RCD 500) to 3rd generation (RCD 210, RCD 310, RNS 310, RCD 510) power drain issue | my-gti.com
Most people have sourced them from Fleabay, just enter a search for 1K0907530, but places like Carsystems also have them.
Oh, and you will need to be able to code it too - mine thought it was in a LHD Audi TT and spoke German... You might get lucky and find one at a wreckers, but it is a good idea to find someone friendly to help you fit and code it.
Al..
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