I've never seen these available from anyone in forever----that's a long time!
That being the case and you're intent on having such things you'll be best advised making them yourself. I would require a 1/8" or maybe 3/32" lexan cut to fit the space. The only real challenge would be how to attach them to the quarter panel "lip" which forms the wheel arch.
Then you'd have contend with whatever wet material or debris would collect in that area or attachement point which could very well lead to body rust.
As a curiosty what are you hoping to accomplish with such things?