I'm in the process of doing this right now for my project and I can tell you, the Montero calipers will line up perfectly to the mount holes on a 1g hub with the 2g rotors. you do need to grind a little bit of the caliper off to make it fit right. another thing you have to consider is running a bigger wheel the 2 piston calipers are huge compared to the single piston calipers count on running at least a 16" rim I'd think.
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It hits right here.
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You'll also need to either get a bolt with a shorter height or grind into the steering arm on the hub.
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