I have a genset 4bt that Im trying to collect parts for to swap into my scout. My next challenge is getting the correct fan pulley. The one it came with doesn't fit on the hub correctly. The PN for the pulley is 3914462 and my hub assembly is 3901364. The bolt holes for the pulley dont line up with the bolt holes on the hub. Any advise on the correct pulley I need? Also, I plan on using the top mount v-belt driven vacuum pump which I have the pulley for. Does that just bolt over top of the fan pulley?