2020 Holiday Rambler Admiral 32S Slide out screws

[Chivobones]

I inspected my coach and saw there are 8 missing screws from the slide trims. They are black and I bought some #10 replacements from Lowe's. The factory screws I removed as a go-by look cut down to about 5 threads long. It is hard to to think those screws hold the trim flush to body going down the road (maybe the silicone helps). I cut one that I bought down and it did not seem to go in as the factory one did. Is there a place to buy those screws that anyone knows about? TYIA.