You have come to the right place for help on your Krag. The section your inquiry is in may not get noticed though. Your regular gunsmiths in the Phoenix area could install the sight for you if you are not comfortable doing that. Not everyone has gunsmith quality screw drivers for not damaging the screws or the feel for the correct tightness when installing the sight.
A regular gunsmith will not know the nuances of getting the right sight for your gun and he would probably have to charge your for the time to research and finding the correct one. Since you are trying to restore a military Krag you will be found by the more knowledgeable on this sight if you repost under "US Military Krags". If you do this I am sure the regulars will have a wealth of info for you as well as being able to point you to the correct replacement.