The inquiry about the ARC 5 pot got me looking for 'The pot guy' (probably don't want to google that)   He has a website and sold vintage parts and NOS pots, plus he made up rare custom pots like oddball combo of K ohms and Megohms of the 2 section RF gain control in a Hammarlund receiver using all new components.  I think he is like William Perry in that he must have bought up the nationwide inventory of pots from closing electronics stores.   Anyway, I can't find him, and while it may be a bit pricey, it would be brand new.  Remember the days when you could go to a Lafayette Electronics store and request a 500K audio taper with an on/off switch and the salesman would go to the back, bring out 2 Centralab boxes and assemble it right on the counter?

Charlie, W4MEC in NC