Hi,
I believe the 501x outdrives will fit but they are not necessary. I super glued the plastic ring holders to the outdrives and the diff ring to the plastic ring holders. I did not sand the rings like some people do, just degreased them. i tend to replace steel diff balls with ceramic ones, i feel they grip better. I would not tighten it too much, just make sure that the slipper does the slipping and not the rear diff, if left to slip with loads of power it will soon melt.
Cheers
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