I just replaced mine with one from Cummins, and the replacement was a Concentric from India. Original one was a Concentric from England.

 

Sounds like my shatty re-man hydro boost pumps. After 3 pumps in 40k miles I bit the bullet and spent 10x as much on the re-designed one from Dodge. It better last a long freakin time!
Re-man parts from any of the parts stores come from the same few companies, so typically a Napa re-man part is no better then an Autozone part.
It sucks but any more, unless it's an emergency repair I try to seek out OE parts if it's something that can leave me stranded or takes a long time to install.
I think the parts stores rely on the majority of people losing the proof of purchase to collect on the warranty and therefore can keep collecting $ for cheaply rebuilt parts.

 

I believe Sinister Diesel offers a billet wp for 6.0's.
They could clean up offering one for us.