These are what my Local GAS Station put in my Epi Sheri II, and had put in my (ex) Ibanez ARC300 (sorry bout that, strummy...). It's their #1 choice for 'buckers. The link is to Musicians FIEND only for convenience.
DiMarzio 500K Custom Taper Pots
I paid $5 each for them.
I dunno if they match precisely or are actually 500K, and I don't really care. I just know they work really well and do what I want them to do...unlike the stock pots that came on the Epi or Ibanez.
^^
AXES: Fender '81 The STRAT, '12 Standard Tele, '78 Musicmaster Bass, '13 CN-240SCE Thinline; Rickenbacker '82 360-12BWB; Epiphone '05 Casino, '08 John Lennon EJ-160E; Guild '70 D-40NT; Ovation '99 Celebrity CS-257; Yamaha '96 FG411CE-12; Washburn '05 M6SW Mando, '08 Oscar Schmidt OU250Bell Uke; Johnson '96 JR-200-SB Squareneck Reso; Hofner '07 Icon B-Bass; Ibanez '12 AR-325. AMPS: Tech 21 Trademark 10; Peavey ValveKing Royal 8; Fender Acoustonic 90, Passport Mini, Mini Tonemaster; Marshall MS-2 Micro Stack; Behringer BX-108 Thunderbird; Tom Scholz Rockman. PEDALS/FX: Boss ME-50; Yamaha EMP100; Stage DE-1; Samson C-Com 16 L.R. Baggs ParaAcoustic D.I; MXR EQ-10.