I I can't imagine a taper (starting) tap will work too well, you'll need a bottoming tap. Or maybe a plug tap will work. In any event, you probably are not going to get it locally unless you have an industrial supply.

It says M10 x 1.5 on paragon's site. There have been other sizes, but I can't imagine you having access to unbrazed bosses for those other sizes. M10 x 1.5 is the standard 10mm coarse thread.