Excellent reminder Ron. My AC's shroud was hanging on by only 3 screws when I bought it. I drove my PC to an old fashioned style ACE Hardware with a huge offering of screws, washers, etc and found better than originals. Let me see if I have pics somewhere.
Basically I found a size to fit the slightly worn holes (and the reason the originals fell/vibrated out), short enough to not touch the inner AC wall and with a wide flange to spread out their grip across a large amount of the plastic shroud to avoid any extra stress on that plastic. Each time I found a screw that I thought would work I went up on the roof and tested it. The hardware guy was quite helpful and willing to run between my RV and the parts bins when something was "almost the right size" and swap to size up or down.
Make sure you get stainless steel. One of my 3 was not and was quite rusty. Another of the 3 was too long and rubbed a dent&scratch into the AC cabinet. I sanded & sealed that before I repainted the lower half of the AC to match my green paint theme.
Larry. (LRUCH,,, but spell chk likes to change out to lurch.
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