Yep, no surprises there. I knew the wiring would have to be extended and the PS hoses re-routed, and yes, the brackets would need to be swapped.
I had another look under the hood of a '99 Pathy this morning. Good news is that from what I can tell the alternators mount to their respective brackets at the same points, so you could mount the X alternator to the Pathy bracket. Still can't see the Pathy pump, and she confirmed she isn't up to letting me drop her splash shield to have a look from below, but I've got a feeling they'll mount the same too.
My new concern is if there is even room on the passenger side of the engine for the alternator to fit properly between the block and body/frame. There seems to be more room in that area on the Pathy than the X. Also I can't tell how the PS pump on the Pathy is tensioned. The X alternator pivots on 2 bolts with a third on a sliding bracket, but I don't see any indication of a similar setup on the Pathy pump. Again, I can't see down there well though.
Sometime this week I will drive my X to work and do a side-by-side visual as best I can.
Brent