A vlsd is a vlsd, it doesn't matter what car it came out of. If you're going to put a vlsd in it, just get a stock (s-13 or s-14) vlsd if you can as it has the stock gears. The j-30 diff has a taller gear (3.9) so it will kinda suck on a stock ka. The r-32 diff is the gem on your list. If it is a true GTR diff I don't think it will be a vlsd, I think they are clutch type diffs. Also it will come with a 4.36 ring and pinion, which does WONDERS for a stock KA. As far as I know the r-32 diff should bolt-in with different axles. The r-33 and 34 diff housings will not work though.
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