The piece on the left is the one, it screws onto the bit that presses against the disk.
It hooks onto two white pegs on the face plate, unfortunately one peg has dropped off on mine.
I think the loss of one of the white pegs made the drive closing mechanism go on an angle and twist off the plastic hole it sits in.
I'd prefer authentic if possible, I'm wondering if the drives are possibly generic over a range of computers?
