Access Mud Flaps A10100311 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; Hitch Mount; 20.5 in. x 37.88 in.; Access Rockstar 04+ XL F-350 Mud Flaps