ABS and non-ABS hubs are identical.
Also, as a quick update: J30 hubs will fit onto an S14 spindle, but the bearings aren't as wide, so spacers are needed. a friend of mine is working on the spacers thing, although I'm wondering why not just make a spacer to just bolt a J30 hub onto a S13 spindle and make things even easier (j30 hubs are easy to get... at least around here).
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