Dont's buy that. It's too expensive. You can buy just the 4 orange o-rings and 6 screws from nitro house. I just bought 5 packs of those for my diffs. Btw, you have 8 spyder gears instead of 6 like you thought. You also count the 2 bigger bevel gears.
Anyway, here's the link:
http://www.nitrohouse.com/parts_hyper_8.htm. Scroll down some. Part # OFN 19444 (Hyper 7) or 87444 (Hyper 8.5)
Here's what it looks like:
http://www.rcmart.com/catalog/rc-hyp...th=595_921_586