Not sure about this thick or thin bit but when I've done what your thinking it was the other way round, I had no locker and wanted to regear, it depended on the ratio I was to fit that mattered on which locker was fitted at the same time. I remember something up to a certain ratio was 1 model and above that was a different model. Standard ratios can be different in your car too depending if auto or manual. My two cents worth anyway, hope it all works for you.
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Modifications,what modifications? That's factory fitted..........
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