I'm looking at replacing the rusty old brake bleeders on my '82 nighthawk with speed bleeders, but I can't figure out the diameter from the parts fiche (don't want to pull them out and re-bleed my brakes until I have to), does anyone know offhand if they're 8mm or 7mm? Z1 has both sizes, and I want to make sure I get the right ones. Thanks in advance!