Can't be that expensive to get the tires swapped over.
Check the brake section, there are a few threads about brake upgrades including commodore conversions there, but in order to change the stud pattern you'd need to change the hub and from what I hear that's a bit harder than it sounds. I don't think you'd find a whole strut that was the same length, same bolt pattern and fitted on your ball joints and steering arms. Still, I'm pretty sure that what works on a 1200 or 120Y will fit in a Sunny, so someone may prove me wrong.
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