Did some more digging and I came up with Bourns conductive plastic
pots. They are not cheap but they too are a great product. Moreover
they have roughly the same specs as the Clarostat 380 series and their
price is about the same. I believe somebody might have mentioned them
somewhere on this thread--whoever it was...good call!! They are
available at Mouser Electronics. Best of all, they were designed
specifically for guitar.
Anyway, if any of you are interested here are the numbers for both
250k and 500k 0.25W CP Pots.
Thanks everyone for your insights and help.