Ethan;

Bleaders are the same thread all around, but fronts are longer if I remember correctly.

This is a tricky operation because if you drill too deep, you will bung up the bleeding nipple seat...and that's bad!...I suggest you soak the bleeder with penetrating oil for as long as possible before attempting anything...you may want to install a rebuilt unit, and return these cores

The only other trick I could suggest is to remove the caliper from the car for this work, and to soak the bleeding nipples with penetrating oil for as long as you can...which means you will likely need to replace the lines too because these will spin off also...

I suggest use of anti-seize on bleeding nipples (and lines) which would have prevented this!

Cheers