I dont know if you've had a look under the shift boot yet, but if the Mk4's dont have a thread as such, they use a clamp on style. Im assuming the shaft in my old bora would be the same as in yours. When I changed the knob I couldnt get the clamp that came with the new knob to hold it tight enough, so I used a high strength hose clamp instead - worked a treat!
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