https://motorsporthardware.com/product/78mm-black-bullet-nose-race-stud-kit-14x1-5/ here is the kit I'm using, it doesn't stock out past the base of the wheel itself. If you look up at the photos. I think the 78mm length is just right. Allows for 10-15mm spacers if needed.
Anthony C on FB MK8 group has his harness kit, which might be one of the best kits out.
Only issue with USP harness, is that it's got the brake light switchback for signal light, which isn't how the EU tail lights suppose to behave.
You use the the OEM connector part that I listed. You re-pin it to the NEW harness included with the kit.
You replace the brown 8pin connector (EU connector) with the 6pin connector (NA connector). This allows you to retain the plug n play aspect.
The brown connector would normally work for...