Definately not Bosch for the toyotas. Its been my experience that they were the wrong plug for my motor.
I used ac delco rapid fire plugs and seems to be good.
However there has been some good threads on plugs in the 4runner board. I think the conclusion was NGK but don't know which one.

92 4Runner SR5 3.0 standard tranny
4.88 gears, rear elocked, OME coils, SAW Tbars, allpro rock sliders and rear bumper, custom made front, downey v6 headers ...