Everything was going well until I decided to trial fit the lower headlight trim. I found out that it width is different. The S6 trim is wider than the S4. I had wanted to keep my S4 blinkers, but I'll have to use the S6 fenders (and blinkers) now. The blinker is also a little taller than the headlight, as seen in the closeup. I also have already added the euro side blinkers. After fitting the S6 fenders and blinkers everything went together without any problems.