Based on this attachment, I would say you don’t have a factory mast raising pole if it is 1¼” in diameter.
And I don’t think you have an actual problem, anyway, because the pole does not lever against the edge of the hole while in use, if it is properly rigged. The halyard and the main sheet should keep the pole positioned without pressing on the edge of the hole.
So it doesn’t really matter if the hole is a little beat up, I think, so long as the end of the pole rests properly against the inside of the mast through the hole.
If you really want to replace that plate, I would buy the factory piece (from this web site?), and enlarge the hole as needed to fit your pole.