mmm i do agree with you people may think things are factory fitted when they are really dealer fitted/ after market items which is very likely with these sill trims, both front and back edges of a prem sill trim are tapered back towards the centre of the car the front is angled to the back of the car the back cut is angled to the front of the car when i say angled i dont mean the obvious angle in this pic i mean the ribbed sections taper out if you were to set up a drop saw and cut this angle you would end up with hollow ribs it was a very good job no matter how it was done