which master cylinder/booster can I use?

[19GMC63]

Gonna make a trip to pull-a-part this weekend, and I was wondering which power MCs will fit my truck?

For those of you who've done it, what do I need to do to make them work for my the 'ol gmc?
Do the brackets line up? Brake lines the same size? What about the pushrod?

Also, is there anything special I should look out for? I've heard 3/4 tons have bigger boosters. Which are single diaphragm and which are dual?

Any input/help would be much appreciated. Pics would help too.