I've recently gained an annoying scratch on my windscreen, right in my line of sight. It depends how annoying it gets but I may need a new windscreen. Thing is, do I just swap like for like or should I get the windscreen that the auto-dim mirror fits on so I can retrofit auto lights? I've read many threads but ultimately can't find anyone who has retrofitted this. Hazzy Dayz fit it at nearly £600 (not including windscreen) but can't see why the price is this high. What do you guys think?