Access Mud Flaps A10200911 ROCKSTAR(TM) mud flaps are the best fitting hitch mounted mud flaps! The unique model specific design features a custom fit aluminum frame with stabilizer plate, stainless steel hardware and 1/2" rubber flaps. ROCKSTAR" Mud Flap XL ROCKSTAR" Mud Flap XL; Smooth Mill; Access Rockstar XL 2019+ Chevy/GMC Full Size 1500 Smooth Mill Hitch Mounted Mud Flaps