You can replace your wings with mk3 gti wings, which have the holes for the trim bits, or drill yours.
I believe the ones with the square indicators didn't have the holes, or they might all have them - i only know mine!
Boneybradley sells good quality wings @ oemandmore.co.uk - sorted me out with a pair of wings for an extremely good price, and excellent service also. just need em painted in your color.