Had a look at the how2 but not 100% sure... I bought a hid kit for dipped beam off ebay (used the same company for months) and its been plug and play really for my mk3 gsi...but it seems the mk4 is different.
Reading the how2 I done the cutting of the bulb holder and got that in place but unsure where to plug the 2 spade connectors in ?? on the mk3 gsi it was just into the original connector for the bulbs.