I would love to see a definitive answer, from a couple of hours on forums I have found no bolt on bench for the US/canadian automatic left hand drive 80 series. There is the ebrake, which I'd prefer not to bypass (plus mine is 5 speed converted need that brake badly)
I've read that there is a Lexus bench, even it required fabrication for a 80 series: wider. One suggested a Sequoia front seat was very close and appeared to have the same electric/controls. I have ridden in 60/40 bench seats with 5 speed in OZ, not near as comfortable as the factory buckets. I'd really like to see this done! Post pics here and at IH8MUD with your solution. If one has deep pockets it has been suggested to take the truck to a shop that does accessibility modifications to relocate the Ebrake. It would not be impossible with the 20 and 25 year rules (yes they are kinda grey to import a diesel with the options you want into even CA) but that's a whole different thread of worms.