1/4 inch Brass finish.
The diameter of the screw posts are all the same, it comes down to the length. the 1/4 inch will be just a tad too long, but the best fit overall.
over the years, I've used all three offered screw posts. The black works well from the Star wars tuff I do, even the silver ones for a contrast, but for Galactica, it's Brass baby