So my dad gave me a early birthday gift. A Ruger 1911 model 6715 Talo edition. Gun is a heck of a shooter but I am wanting to replace both front and rear sights with some night sights. It came with Novak 3 dot sights but I've seen somewhere that there are 2 different dovetail sizes for the Novak sights. How do I measure to find what sights will fit? Plan on taking the gun to a gunsmith to install but would like to order the sights to take in with the gun.Thanks for any help.