Hi Don...!
If I look at the photos above - the insides do appear threaded - BUT they should be a smaller OD then the grip screw (you can't screw a grip screw into them as the BW grips). If they indeed have no "threads" - then no, they need to be threaded.
As well - most repros will be "off" on the top left grip, and not have a counter-sunk to the holes - as these do have...
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