Totally unfamiliar with your unit, but it seems that a speaker issue like you describe would likely be a wiring/connection issue. If you are good at yoga you might be able to get positioned under the dash to be able to see or feel the back of the stereo and maybe spot a loose connection. I expect a car stereo shop could help if you can't find anything.
As for a/c roof vent plastic parts, you could try the PPL Motorhome site. They are pretty well equipped and you may be able to find what you need there. Failing that, perhaps the manufacturer could provide some support info.
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2022 RAM 3500 Cummins SRW long bed, 2019 Open Range 319 RLS, Reese Goosebox, disk brakes
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