I hope nobody minds me jumping in here:
What do the numbers correspond to? I get that they're sizes, but is it [diameter]-[length] (in mm) or something else?
an 8-32 screw has a diameter of 8 (not sure what unit it's in) and would average 32 threads per inch along the shaft.
6-32, diameter of 6, with 32 threads per inch down the shaft.
these are both fairly standard small machine screws, the trick is finding them in the proper lengths you need, usually 1/2" or shorter depending on what you're mounting to the saber.
hope this helps