marshall jcm3210 mosfet - gain pot w/pull switch

[Mars Amp Repair]

Say,
All this talk of the Mosfet 100 & I've got one that needs the 1MA gain pot w/pull switch.
Does anyone have a source for this pot? Korg doesn't list any parts for this amp but the replacements for the power Mosfets.

any other model that anyone knows this pot can also be found in? thanx, glen