chetrog

I am going to be needing a alternator , but I have a couple question that I anyone could help. I have a 2005 Jeep Liberty. I am contemplating getting this alternator. http://www.mechman.com/alternators/dodge/dakota/3-7l/2000-2006/s-series-240-amp-alternator-for-3-7-4-7-chrysler-late . I Notice that the Installation notes says "This unit comes equipped with a smaller 1.75 inch diamter alternator pulley, and will require a slightly shorter drive belt for proper belt tension." How do i know what size belt i will need? I had a stroke years ago and I'm not always the smartest brick in the load. Thanks for your time.