Howdy,i just replaced the alternator in my 91 N/A and the most pain free way to do it is to remove it from the top.Take all the bolts from the alternator and remove the alt and let that sucka just lay on the bottom.Then remove all the bolts from the alternator bracket(i think there was 5,not 100%,just feel around and find them all),then remove the bracket from the top,take the alternator out from the top with a little twisting and turning and then reverse the whole process.Took me about 45 minutes to do it all and that included the obligatory beer break,ggod luck.