I know someone with a Special (not sure of the year) and it had "Chrysler" mud flaps installed. Where it said "300M" was worn away but they were OEM. He said they came with the car when he bought it but was not the first owner. The clearance seemed fine to me.
I have a 03 special. I had some mud flaps (molded one's) I used a dremel tool to change the contours around the lower cladding. It looks like it was made for the special. So with a little work, it can be done. If you get the flat mud flaps the job is easier. I will agree they can scrape if mounted too low.