My Monaco used that same "C" channel. I bought the remaining pieces that the Diesel Equipment Co. had left, several years ago. You would think that they would continue to offer something that is still used on thousands of coaches.
You'll probably need to find something similar, like the stuff used to cover wiring when running an exposed outlet inside of a house, and then paint it black.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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