[simplechamp]

I'm pretty sure Hyper 9 diffs are much slimmer than the standard Ofna K-type diffs used on Hyper 7/8/8.5 (This is why the Slipperential doesn't fit in the Hyper 9 center diff bulk, and the Slipperential is already slimmer than Ofna diffs)

The 8 spider diffs that are the larger size have a 2-piece alloy diff cup and 6 screws securing the spur. Any other diffs with plastic case and 4 screws securing the spur are regular 6 spider.