Replaced our mud flaps on a P30 years ago. If I remember correctly, I went to a NAPA store with the measurements I needed, bought TRUCK mudflaps, then cut them to size with boxcutters. They were cheap (relatively so), worked fine and still looked good years later when I sold the coach.
FMCA Local Chapter Secretary - Bay Area TravelerS (BATS)
Jim & Shirley & Abbie (Scottish Terrier)
2013 Newmar Canyon Star 3911, 2005 Dodge Grand Caravan - Braun Accessibility Modified Toad, Remco Lube Pump, 5 Star Tune, Progressive Industries EMS-HW50C, Coach Net Emergency Road Service, FMCA 378968