It's 6N2 TDI so has a MKIV gearbox and shift linkage. I've had a look and the system looks exactly the same as the MKIV.
The problem is the knob I want to fit is just a proper pool ball that's been drilled. I'm not sure if I can therefore get it onto the shaft or if with the original knob removed the shaft will be short underneath so with just the pool ball on it's be too low down.
Nick