From the picture that plate looks narrower than the Zspar plate on my 23.5.
It is probably only an issue when raising or lower the mast and has managed for 20 years or so? Replacing the fasteners and keeping an eye on it is a viable option.
You could have a larger stainless-steel plate made and maybe add more screws. From the picture it looks as though you can only extend it out one way. to see is the embedded plate extends out spray a can of the compressed air duster (keyboard cleaner) upside down on the fiberglass for several seconds. The fiberglass will get very cold the metal plate will too, when you stop spraying water will condense on the fiberglass and a frost will form. The metal will stay cold longer, and you will see a line of frost form along the perimeter of the embedded plate. Be ready to mark it with a pencil. The same trick can be pulled off with dry ice by rubbing it along the fiberglass but is a little more dangerous to your fingers and the dry ice is not quite as portable as a can of duster.
it also looks like there is a crack in the bracket that I presume secures your gin pole. That is more worrisome than the broken screws.
