Newb question here; I'd like to replace the GI sights on my Auto-Ordnance A1 because the mil-spec sights pretty much suck and would like to replace them with Trijicon or Meprolight tritium or FO sights. The rear sights are a dovetail and the front sight is a post. I'm not new to firearms but am new to 1911s and would like to advice on how to measure the front post hole and rear dovetail so that I order the correct replacement sights. I already have a staking tool and have previous experience replacing the sights on my wife's PT1911 but I got lucky and just happened to order the right sized Trijicon sights. Thanks for your time.