Part number and price for wheel arch trim

Due to ****** potholes, I've damaged the trim by the wheel arch. It's the part found here:

Front Left wheel, trace the liner from front to back until you get to the bottom rear of the trim. Under this horizontal to the ground is another smaller part of trim bolted onto the chassis and behind the arch trim.

Audi quoted me £70 to supply and fit it, but think this is way too much as it's only a small part. Anyone know the part number and price?

Thanks