I believe it would really depend on which ones you get. The AEM kit comes with the Power Steering and the Alternator pulley, then the Unorthodox has that and they've the crank pulley. When my friend did his, he first bought belts a little bit smaller than the original ones, tried them. Took them back and exchanged them. Tried them... etc. We ended up going 3 times I think. You've just got to gradually narrow it down.