These guys make seat brackets that will work:
Planted Technology
Home page
I don't know anything about them other than they're made in the USA and
@
Formidable
used them on his sick ass rig:
BRIDE Vorga seats installed
There was a bracket update there: "The Hilux 185 JDM Bride brackets are a perfect fit for US 3rd gen 4runners."
Ok no more edits - Anything to avoid doing work here on a Friday at 4:45