So for those unaware, problems arise when you decide to play with your rear end (no joke intended). The S15 helical differential (HLSD) requires specific output shafts. The standard output shafts on our cars are 29-spline and the S15 are very specific 30-spline shafts. They are practically identical EXCEPT for the spline count, so it is easy to get them confused. As far as I know, the S15 HLSD ONLY came with the 3-star (3x2) style output shafts and flanges, so the only thing you need to make sure when buying an S15 HLSD is that it comes with the proper shafts. If it doesnt, then you will most likely get shafted trying to find the shafts - they're rather difficult to find them when you need them here in the US.
By the way, anyone with a careful eye will notice that one shaft is longer than the other. The LH shaft is the long one, the RH shaft is shorter. Conversely, axle lengths are also different as LH is shorter than the RH.
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