Upload & Sell: Off
No one can identify the parts for you if you don't tell us the lens model.
And, if you need someone to get for you or sell you some screws or parts, you need to start with part numbers.
Okay, piece I could not identify is rear mount ring. Nikon will not sell individual screws and parts -- but they will replace them for a HIGH FEE! Yay!!
Hoping this effectively "bumps" thread so more folks can...chime in