For starters, why don't the Hogue grips fit? Did you mistakenly buy ones meant for an Officers ACP?
The Series 80 Government Model is a standard full size, 5" 1911 in most respects. However there have been different versions released over the years, some with different sights, grips, hammers, triggers, et cetera. Without knowing what version you have or the vintage I can't tell you what replacement sights will fit, for example.
Try not to fall into the common trap of wanting to replace everything on your new 1911 just to make it "better". Know what you're changing out, and why. You may spend a lot of money fixing things that weren't broken to begin with. Shoot it for at least 500 rounds, then decide what you don't like and want improved. Vintage 1911's should NEVER be refinished or modified because it ruins any value they had as a collectible firearm.