You might want to consider that part addition. If you have an ER gun, many of them have the pointer or the pointer tip (the little round rivet sight mark) removed. They were removed by the Irish army on guns issued in WWII, or so it seems based on a few pictures of the rifles where they can be seen. In essence your restoration is changing the last deliberately issued state as it came out of Irish army stock in 1960.
Check out gun boards, there are a few detailed posts on the rifles in a sticky labeled FF rifles or something like that.