Yup, they fit. I put the gloss black facelift golf R sideskirts on my GSW. For best OEM fitment you will need to drill your rockers and then use the self tapping screws, which sounds like a big deal but isn’t really. Otherwise you could just use 3M mounting tape along the rocker and there should be a few existing screw holes to use as solid mounting points under the rocker. I have parts lists for Mk7 & Mk7.5 if you’re interested.
You can buy the OEM kits used (recommend car-part or EBay for them rather than dealer pricing new), EBay, or Maxton side skirts for the TSI from their UK website.
check out this guy’s post on the first page of his build thread:
https://www.golfmk7.com/forums/index.php?threads/bäsemödel-1-8-tsi-project.330229/