[Guy]

That is the "official" Newell trim of the day. We have it also. If the aluminum is good. there is a source for the insert to cover the screws, but it is an inferior product used on todays rvs. It's called qpn vinyl exterior insert molding trim  screw cover, available on Amazon .  Steele Rubber Products also has an item called insert trim, and another called screw track cover insert, but it's very pricey.  Steelerubber.com Good luck.