This item is used on multiple models.
NOTICE regarding this part on the 310GT/320GT original reels:
See part number 50N-320 to determine whether you have older or newer shield.
OPEN SLOT FROM ONE END TO THE OTHER:
This is the newer shield which is completely open from one end to the other (50N-310 or 50N-320 depending on your reel), which uses 44-330 and 43-330 bearings. If changing from old shield to the newer one, you must also change both of the worm bearings.
50N-320/50N-310 New shields uses 44-330 and 43-330 bearings on the 320GT reel.
CLOSED RINGS ON THE ENDS:
If your current shield has closed ends with a slot cut down the middle, then you have the older version. ALL OF THE OLDER PARTS ARE DISCONTINUED AND NO LONGER AVAILABLE.
50-320/50-310 Older shields uses 44-320 and 43-320 bearings.