Cool little fact: The E-250 pulley that came on the saginaw pump is just SLIGHTLY different (5-7/8" vs. 5-1/2") so I'm going to end up using that pulley instead of modifying the ranger plastic pulley (hub size is smaller on the OE ranger pulley). I found a list of serpentine belt lengths and part #'s on Goodyears website. I did some measuring, and the E-250 pulley needs a 1.25" longer belt than the ranger pulley. So instead of the belt being 80.51" (ranger 4.0, no A/C) I need it to be 81.76" long which would make me need Goodyear Gatorback belt # 4060815 (81.75" long)