The original Baker ivory front sights that I have seen & have had some experience with [Sterling SBT w/floating rib] had a steel sleeve around them that pressed into the sight's hole, they were NOT threaded. I spent a lot of effort trying to find one 40 years ago, to no avail.

I don't know if the Paragon used the same type.

Should you do come up with a source please share it with us. Thanks & wishing you the very best of luck!