Hi is the front end of the chassis (say frome the handbrake mounting) forward the same on both S1 and S2? are the differences all at the rear - trailing / semi-trailing arms and their mounting parts of the chassis?
Mick, I got your email but your reply address doesn't work.
I don't know what differences there are between S1 to S3 at the front but I did see a pic recently where the front was different (from my S3) under the rad mounting area. It might even have been your car.