I've just bought some off eBay, £35 delivered, test fitted them to the car and fit perfect. Front ones clip into body work and then self tapping screws, so 5 mins per side?
Rear ones you need a torx screwdriver to remove existing screws, to then use same screws to fix back on. These might need the wheels removing though so 15mins per side maybe? Certainly wouldn't pay either of those prices...
Just done the front ones, 20mins, but a lot of that was spent firstly not realising the plugs in place needed to be loosened off by pushing a pin in the middle, and then they took a fair amount of time to pull out without breaking them. If the middle pin falls inside the wheel liner simply pull the liner up and get them out.
The new ones clip on top and utilise those two clips, used a self tapper to secure the inner most piece to the liner, and another one to pull the top in closer as the clip still leaves a bit of a gap
I was originally going to go for OEM mudflaps but tbh when I seen them on a B8 S-Line I thought they were ugly and bulky looking so I had purchased the same set for 35 before Christmas and they are great.
Really easy to fit as said and they actually look like they came on the car and people have asked for the link. lol