I promised myself I wouldn't wade into these oil debates but here I am.
The spec for a 1hdt/FT is JASO-DH1 - this is an ancient spec from 30 years ago. Pretty much any oil will be fine. I use whatever diesel mineral oil is on special at the FLAPS...
These are considered the "standard" here in NZ. Dunno if he ships but he's easy to get hold of and ask.
https://acfab.co.nz/products/toyota-landcruiser-80-series