Hello All.
Thanks to Don's diligence I am off searching for more information about the hubs. A Jeep forum had a copy of a 1968 advertisement for what looks like a match to the one I snapped a photograph of. As my photograph shows it looks like Teddy's hubs need some seal work done to it too. The photograph of the 1968 brochure was sourced from 
1968 Cutlass Locking hubs Brochure - Jeep Willys World on May 12, 2018.
More chasing up on Toyota diesels. The spooky thing is that when I drove back into town from my adventures to buy some dinner there was a very pristine 1980-90 Toyota Hilux right next to where I parked. A Toyota 2.4D. With the benefit of time I remember driving one when I was with Ipswich City Council Parks and Gardens some time in the late 1980s.
Can anyone give me some hints where Toyota diesel engine numbers lurk? 
After that - what size batteries do they use? Teddy is currently battery-less. From the look of the battery frame it is a lot smaller that the Century N70ZZ 4wd battery I have on hand.
Thanks you for the assistance.
Kind Regards
Lionel