Wish I'd seen this thread a week ago!
Worried about the quality of Tesla black paint, I ordered some from Amazon and fitted them last weekend. The first set I got was missing some pieces, but couldn't replace as was out of stock, so I got some from a diferent vendor - and, apart from the box they arrived in, they were exactly the same.
Frankly, they look OEM. The shape of the wheel arch, location of the fittings and the perfect shape of the mud flaps ... it's too good to be some vanilla third party creation IMO. Maybe they were originally planned but dropped for whatever reason.
They real work well, haven't got caught on the road humps that plague my area, and ... amazing bonus ... they have already stopped me from curbing the front passenger wheel! This is because they stick out a bit from the car and so hit the curb before the wheel did.