Indices templates.

Hi all. I have been making dials for some time now. I usually engrave a walled hole for the lume, but I want to get a better finish, so I have bought some indices separately. Now I have the challenge - each has 2 pillars on the back for fixing into the dial. Does anyone know how I can get a template for my laser to mark the holes in the right places? Otherwise, this is going to be some complex measuring! Cheers.