NEED 2wd PS 4 bolt gear box case plate

[ChevyDude]

I was installing the PS steering gear box on my 2wd and had mistakenly put the pitman arm on in the wrong position. While taking the pitman arm back off the 4 bolt case plate on the gear box opposite side of the pitman arm broke. It's the case that has what looks like an adjustment screw and is sealed with a rubber o-ring or mybe it's the gear inspection plate. Can I buy another one of these cases??? Any help would be appreciated, my nice day off just turned to sh!t.