While cosmetically similar, the JDM Prado wheels and the US 80 wheels are not the same.
The 70-series (Prado) alloy wheels I referenced above are a 16 x 6" wheel with zero offset, thus 3.5" backspacing. Direct fit on a 6-lug 70-series, no spacer required. Work great with 235/85-16 tires, but can also work with 255/85-16 if you want to run 33". Nowhere near wide enough for a 315.
The early US market 80-series alloy wheels are a 15 x 7" wheel with 8mm positive offset, thus (about) 4 5/16" backspacing. You'd probably need spacers to run them on a 70-series, and you'd be limited to 15" tire sizes.
I'd assume the 4-Runner alloys of the same period are the same as the US 80-series wheels, but I've never had any so can't say for sure.