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I'm sort of guessing here but I think I recall that there is a difference in the setup for the winch that holds the spare tire up on the trucks that came with the 31X10.5 tires. If so, then the hole in the bumper may be in a slightly different spot.


That?s right. When you have 31" (or 265/75R15) tires stock, you?ve 31" spare tire also. And "the winch" angle is different between those models. Check: http://www.toyotasurf.asn.au/techsite/downloads/ToyotaSurfOwnersManual.pdf
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4Runner 3.0 Turbo-Diesel, 2" suspension lift, 33x10.50R15 tires