What are these? Is it vital i install these to keep the trem stable and in tune ive searched the internetz and i cant find anything my trem is the Edge Zero.
They were fitted as standard on the original and Lo Pro Edge - there's a little grub screw inside the trem post that locks them so they won't shift. The problem was that too many people forgot about then and ended up screwing up their posts by trying to adjust them whilst still locked, I think ultimately Ibanez decided they weren't worth the confusion and stopped using them.

Not an essential upgrade by any means, most bridges don't have locking studs but they're part of what makes those particular bridges so reliable.
Actually called Mark!

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