[suicideneil]

Ofna be the only peeps who make an 8 spider diff so far as I know. They are also sold by UE directly on their website, though just getting the cup and end cap is kinda tricky, but they do have a complete 8 spider diff kit for $99 ( ouch ), plus kits for the spyder gears themselves.
All said and done, I don't really see much value in spending that much money just to have 8 spider diffs, the 6 spider version with correct shimming will be bullet proof and near impossible to destroy.

I'm not sure about the Raminator diffs specifically, but my spies tell me the LST/ LST2 diff internals should be a direct fit for the FLM hybrids so I'd assume (*dun dun dun* ) they fit fine in the Ultralites too. Trouble with Losi diffs being there are small differences between seemingly identical diffs from different models, makes life a pain..