I don't have any idea what the part numbers belong to which fan, but I suspect one of them attach to the clutch fan for the AC trucks, and the other is the one you want, a straight 7 blade unit. There are also probably a couple of choices for the spacer length, you probably will need one in the 2" long range.

I presume you have corrected your overheating problem? The pitch on the 4 blade fans I've seen are pretty steep and they pull a lot of air when used with a shroud. I wouldn't necessarily blame the 4 blade fan for the truck running hot. Gene