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Just get your stuff from diffsonline.com, I suspect all the other online retailers that offer upgraded differentials are basically resellers...
Unfortunately changing the ring and pinion is not a straightforward job and you will need to find a specialised workshop to do the install, mainly due to the shims required to ensure proper fit. You can decide to buy the whole set of shims but that doesn't make any economic sense.
Your best bet is to simply buy a rebuilt differential with your desired gearing, and do a straight swap.
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