Bourns Pro Audio 500K Long Life Push Pull DPDT Audio Taper Pot ± 15% tolerance, 3/8 bushing length, 24 tooth knurled split shaft – priced and sold as a single pot. Comes complete with nut.

Either as:

Short Shaft at 19mm for standard projects and pick-guards

Long Shaft at 27.5mm for carved tops and LP style guitars