The motors were from a BMW, they have the same drive gear as the VW so a fairly easy modification. Like this - https://www.thesamba.com/vw/forum/viewtopic.php?t=96710&highlight=bmw window
Got mine today. God, it's huge. Not sure I have the courage to start drilling 14mm holes. It'll wait.
I meant that the holes are enormous. Cutting holes bigger than a few mm in sheet metal, better to use a firtree cutter (Screwfix one is good). Big holes with a twist drill never work out, as the flutes of the drill catch and you end up with a right raggedy mess. The firtrees cut a nice clean hole as big as you like - recommended.
They work perfectly normally, pull the stalk towards you and the HID high beams burn a hole in the back window of the car in front. Actually, the headlights are LED and I seldom get close enough to anything with a back window.