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Maybe have a look at another site (sparkplug.com comes to mind) and see what comes up in there system. I couldn't tell you what the differences are with the ones at autopartswarehouse. I suspect the top one lacks to connector for a direct replacement (so you have to splice wires) while the other 2 are direct replacement. But there are definitely 2 on the truck.
Universal = no connector
Direct fit = proper connector
Go to oxygensensors.com. You will need two sensors, a precat (cyl 1,2,3) and postcat (cyl (4,5,6) IIRC. Two different part #'s. They have the denso oem units and they are plug and play, easy install as long as the old one come out easy. Found at a much better cost here...STICK W/ THE DENSO, NOT UNIV...