Not sure the owner of the 1972 Toyota FJ55 is a machinist or fabricator, but reverse-engineering and/or manufacturing an accurate replacement isn't a typical DIY skill set.
I would suggest hunting down the FJ55 owners forum on the internet, if there is one. I think the audience here is contributing "start from scratch" type solutions which may yet turn out to be the ultimate solution.
How about a complete door? (albeit, 2009):
FJ55 parts...possible SW delivery.
Hope this helps,
Sherwood