The K03 you want is off a longitudinal 1.8t engine so thats Passat/A4 and (A6?).
Beware which ones you buy off eBay, there are chinese copies where people have had mixed results.
Some have lasted quite a few k at 20+psi and others have blown up at the thought of it
Same goes with buying second hand, just have a good look round, they are about.