How does the brake booster look for a 91 Ford truck with a 7.2 460 motor?

How does the brake booster look for a 91 Ford truck with a 7.2 460 motor? - 1

Added (1). Is it circular, square?
Any images or descriptions help. Is it something
you can drive without?

Like any other one would Except you might have a hydra boost system thats boosted by the power steering pump its a big circular chunk of metal with a reservoir attached to it upper left (drivers side ) corner can't miss it

Looks like two 12" dinner plates. It's between the fire wall & the brake master cylinder.