Piezo potentiometer values? PRS replacements?

[Nice F Holes]

Do the core Piezo guitars use a standard 500K log/audio volume pot? And what is the piezo volume/blend pot value? I want to upgrade my SE Piezo with better pots. I found my guitar has a B500K magnetic volume pot which is really bizarre.

Is it possible to get the Piezo volume pot from PTC?

Thank you.