LPS has put parts online for me that were not shown on their website and if they are still making the part they can get it.
The issue with these pumps is there is no wear plate, the casting the rotating group runs on is super hard but does wear over time. I spoke with LPS a while ago about this and they had the ability to get someone to build up the worn spots, harden then grind it back, or they were in the process of getting someone to do it.
If your pump is worn like this, can you see if you can find a shop to grind it flat for you?
If the wear is not really bad, i'd get it ground the few thou to get teh marks out, get a new set of rotating groups and see how you go. I'd like to think you would not take to omuch material off to remove the hardening.