FLEOR 2PCS A/B 250/500K Guitar Bass Potentiometers Brass Short Split Shaft Pots

Resistance: 250k ohms / 500k ohms for option. Short shaft (15.5mm) pot, whole shaft made of brass material, longer-life use, gives you a smoother and more accurate response. 9.5mm (3/8" ). Shaft Length:15.5mm.

eBay