Just had another look at the pic on the computer rather than the iPhone. when i first looked at it it looked like that was a plate down the inside of the radius arm and i thought that might have been one of those SuperFlex arms but the rest of the arm looked stock. Was strange and i could not see past that image.
You are right though, it is the mounting bracket welded to the diff that i am looking at and as such all looks stock.
To the OP, check to make sure that you have rubber bushes in those radius arms, if they are rubber then there will likely be no caster correction built into them and your then running Drop Boxes and it should be sweet.
Its a Nissan! =====> Its a Keeper!! ....... Got a TD42 in it BONUS!!....... I'm a lucky bugger! I've got 2 of em!
Check out my Toy --> MudRunnerTD's GQ From the Ground Up
The only good thing about an 80 series is..... the front end?? Wrong!!, the Engine?? Wrong!! the Full Time 4WD system?? Wrong!! Its the NissanPatrol.com.au stubby holder fitted over the transfer lever.
WARNING: Towballs used for recoveries can, and do kill people and damage property.