Power Steering Pump stud too short

[Gygeneral]

Ok , I'm adding power steering to my car, trying to install my pump and I can't figure out why the nut and washer will not fit on the one stud on the back of the pump. One stud is 1/2 long and the other is 3/4. So the guy who rebuilt the pump, did he reverse that stud, or maybe someone cut it before me. How can I fix this, do I need another stud or is it reversible, or do I need to find another. The nut just barely fits without the washer, I'm assuming there is supposed to be a washer I don't know.
I attached a couple pics.
Any help would be great thanks

 

[Beekeeper]

Pretty sure the studs should be the same length. I have seen them offered in a kit

 

[1 Wild R/T]

Try flipping the stud... 1/2" into the pump is plenty...

 

[Gygeneral]

So is there an o ring back there ? I've never taken one apart. I won't mess up the seal or anything?

 

[OKDart]

The oring is between the pump and the reservoir

 

[Gygeneral]

thanks, I'll try and reverse it today, hopefully the other side of the stud is longer

 

[Gygeneral]

Yep the guy who restored it put it on backwards, I just flipped it and it was the correct lenght, thanks everyone