Alright here's the deal. I swapped a y7 in my ef and plan on using the 91 alternator but need a 4 rib pulley and can't use the crank pulley from the old engine. Well I can but rather not want to. Will the 4 rib fit the 91 alternator or should I just use the 97 alternaot and splice in the new connector? Any have a extra 4 rib laying around?