OT: but in need of help Please!!

[thisolechevy]

I was trying to help my dad fix up an old car of his to sell and had removed the power steering pump in hopes of getting a new one. I had no idea of what I would need off of the original one so took the whole pump in to town with me. And with my bad luck I lost it out of the back of my truck I have no tailgate and I thought it would "ride" and again to my bad luck I can not find anyone who carries the bracket?? whats up with this. I am willing to do anything!! is there any type of "interchange" that I can do? like is there any other model that will fit? I have a new pump all I need is the brackets, and pulley.
Where can I get the brackets and pulley?
Is there anything that will interchange?

it is a 1983 Buick Lesabre Estate wagon 5.0 307
I was told that interchange was '80 throught '85?

HELP PLEASE