A complete mk4 golf arm and aero wiper conversion can be had for about £75 on ebay, but tbh, the vw conversion cost £24, and at 3 times the price your not going to get 3 times the wiping efficiency, imho...
If you do a search there were a few ppl on here a while ago who did the full golf arm conversion and weren't that happy with the results, as i recall.
heres a pic of my lc with the vw conv.. i don't feel they are too bulky, but each to his own..
And the thing i've noticed the most i don't get any wiper lift at speed now, wheras the originals were terrible at anything over 65..