I replace the shower faucet in our forward head on our last boat. I couldn’t find one with the correct centers. So I used a piece of 1/4” white Starboard and overlaid it on the old holes. Worked great and looks fine. Then I could use the faucet I wanted to instead of just what would fit.
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.