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correct width for what? that would mean you are only shortening the diff by 50mm, skyline diffs are more than 50mm bigger than a 1200 diff
and the least you can shorten a skyline axel is something like 110mm, unless you get custom made axels or have some freak axel that doesnt go undersized
im cutting the long tube down 50mm and the short one down 85mm, swapping axels and getting the long one cut down 135mm and the diff is still going to be about 20mm wider than standard 1200 size