I neglected to mention the other big gotcha we may run into... If the Pathy pump and alternator have different physical layouts then it may not even be possible to mount your X pump and alternator to the Pathy brackets. If that's the case, you would have to replace your pump and alternator entirely with Pathy units as well.
I suppose if you nuke your alternator that would be a good time to do it. I know you can find Pathy PS pumps for about $75 used.
Brent