The S3 rear valance is the same on all the sportbacks, this is due to the S3 sportback only been available on the facelift. as long as you have an sline top section on the rear bumper it will fit. The rear bumper on the face lift is three part - top section (same as sline), valance (which you paint to match) and the lower platinium section
Part number are below, they are not cheap, trust me
8P4807521KGRU S3 SPORTBACK VALANCE LOWER
8P4807434G1RR S3 SPORTBACK VALANCE LOWER PLATINIUM