Well, after a bit of checking, it appears that I have the following:
#10-24 x 1/4": All (?) front mounting holes, most back mounting holes. Total of 9.
#8-32 x 1/4": Two rear rail holes on top
#8-32 x 1/2": Finder mount
I have not pulled the three that are holding the current dovetail as I think they may be thread locked. I suspect they will be #8-32 x 1/2" in the back and #10-24 x 1/2" in the front. I'm not really concerned with swapping those ones out yet.
So I guess I need some of each of #8-32 x 1/4" and 1/2", and #10-24 x 1/4" and 1/2". I still have not figured out why they bothered with two different sizes and thread pitches.
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