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.
Avoid the temptation to replace everything on your brand-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 at least 500 rounds through it first, then decide what you don't like and want to improve. Regarding vintage 1911s, pre-1946 pistols are highly collectible in original, unaltered condition and should NEVER be refinished or modified as it completely ruins their monetary value.