I will be flushing the brake system wth new brake fluid and I wanted to know if anyone have the specs for the brake bleeder screw for both front and rear. I will use this as my back-up bleeder screws just in case a screw snaps. Rockauto's website shows a Carlson part number H9407 and H9422 but is doesn't show the size. Local Mazda dealerships quoted me fronts $4.00, rears $8.00. There could be some other best price brands out there thus the size is more important.

Any ideas about this ? Any help will be appreciated.