what i did was to get the aerial plugs in your hand,and carefully push the centre metal part of the plug out of the plastic part. You should be left with 2 bare metal plugs, and two plastic shrouds with 2 very small metal circlips inside (brass coloured).
I just fitted mine and secured the leads using a very small tie wrap to the fan aperture. No problems in operation.
Either this or buy the proper converter from VW for about £20.