Yes, the arial elements are in place on all Mk.V, but if you have the roof antenna
you will have only one amp inside the lid.
VW used several rear windows from factory, but there are only three spare parts
all coming with the connector; one light green, one dark green and one blue glass.
Some come with the necessary connector from factory, some not. So first you have
to look for it. If there's no connector as said before retrofitment is too complicated.