Questions about seat belts, please read!

ok, when i bought my car, it came with working seatbelts. but, it didnt come with the female anchors (the things bolted to the floorpan near the console) in the front or rear. my car is a 91 coupe w/ a titanium gray interior. i can get 4 anchors (2 front 2 rear) off a buddy's 89 hatch w/ charcoal gray interior. are they the same thing just different colors? how large is the bolt that holds them down?

thanks alot guys