I've got a 2007 S3 which has got non-LED Daytime Running Lights (DRLs). I'm wondering whether it's possible to replace the headlight units with the later facelifted version which has got the LED DRLs? Do the later LED headlight units physically fit? Are they different in any way? Do the LED DRLs need anything additional outside of the headlight? Any help would be much appreciated.