Damn son,
you should make 1 single post... a tell all for the IC install. I believe it is 2" and some, if you have it you can measure. The question should be , what size belt do I use for a xxx size pulley?
then your question is answered. I have a 2.75 and am running a belt # 4060680 or 4060880, ill have to check.
Peace,
Joe A