Have a look at the photo.
Set your block so the fitting is on your right side. That's the starboard side for you land lubbers. See the yellow pencil.
There are two types of plungers in the block.
I call them the special plungers and the plain plungers.
Notice the green pencil. That is the hole where the two special plungers and two balls go.
All the rest of the holes get two plain plungers with a spring in the middle.