[Barnsnake]

I can't answer your question with a specific grease or roller count, but I would suggest you don't go "fishing" with a magnet. You'll magnetize any rollers you catch. That's not the place you want all of the metallic debris in the gearbox to end up.

A small amount of any petroleum-based grease should disperse into the tranny fluid without issue. If it's cold enough, Vaseline should work.