The 4wd unit is the correct one because it has the splined center section to accommodate the cv axle shaft.
If your getting a unit listed for the GM or Isuzu vehicle it doesn't matter if you get left or right because when you remove the ABS harness there is no longer a difference between left and right. It is also possible to buy hubs that do not have ABS sensor/harness, below are some part numbers that my research indicated should be a match.
BR930703 (SKF)
051-6367 (Beck/Arnley)
HA590304 (Timken)
715110 (Raybestos Brakes)
515121 (MOOG)
The only difficult aspect of changing a hub is getting a socket that you can get onto the four spindle to hub bolts.
I'll attempt to attach photos of the socket I used. More grinding on both ends would be beneficial.
The highest quality non Bobcat replacement hub appears to be the ACDelco 515110/515111 option. On paper it is listed as
"Gold" as apposed to "Original Equipment" , but I don't know that it is just not marketing.