alright so i got the aem pulley kit and got the power steering pulley replaced w/ no prob but now i can't get the alternator off.

i'm working on a 96 integra rs. i disconnected all the electrical wires going to it and removed the top pivot bolt. now when i go underneath the car to remove the bottom bolt, it's nonexistant. where there should be a 4" bolt w/ nut, there's what looks like a rivot that doesn't go from end to end. i tried knocking it out from the side and no such luck. any idea's? it's kinda hard to explain it so ask any questions and lemme know what you think. thanks