I went to the junkyard and bought a Gen V that has pretty beat up rotors. I also bought a Gen 3 on craigslist (was told it was a Gen V but the guys either lied or didn't know what he was talking about) that has perfect rotors. Are they interchangeable? Can I swap the Gen 3 rotors into the Gen V case?

Also what type of grease is used on the needle bearings?

Thanks,
Zac