Congrats on your new aacquisition
If you can get a Providence Tool company #21 reproduction (feom Buffalo arms?), it should go right on where the old hole was drilled and be the proper 11-36 thread. And the front sight screw should go right in the finger lever retaining pin hole up at the front end of the receiver. If is already as a high front sight installed you should be good to go.
I e mounted several years f these new sights on original 95’s and Brownings. With the new sight you will need that higher front blade.
I have pics posted of one I mounted on my Browning posted in a thread below around pages 12-15 titled "Winchester 1895 (New pic) "
With a bit of running commentary on installation. I do like this sight.
Good luck with whatever sight your choose
Have you hunted with your set up?
Not that one since I’ve put the sight on. But, I’ve hunted a bunch with an original #21. Killed several elk. And I went ahead drilled and tapped the Providence aperture a put in a Marbles aperture. So its actually a bit more advantageous than the original now. I think you will like the Providence sight.