Broken Wheel Cylinder Bolts?

So I'm going to attempt to do my left rear wheel cylinder this weekend. The right rear blew out on me over the winter ... I'm a bit nervous about the left rear.

Everyone I talk to says I'll break two things:
- The hard line
- The bolts holding it in

What size / pitch are the bolts that are holding in the wheel cylinder n the rear? My hard lines are new so getting them off will not be a problem.

Also, is it necessary to disassemble the drum hardware (springs / levers / shoes) for this? I'd like to avoid that part if possible.

some you have to take all the way apart others u don't just matters if u can move the shoes enough to get it out. pb blast it a few times and let it sit on there a bit