Tune TWB5 potentiometer?

Hey bass nerds,

So long story short, the bass pot on my TWB5 is shot and I need a new one. However I'm having a difficult time trying to find this pot anywhere. I believe it's a long B50K ohm pot? Longer than most I've seen. Pictures attached.

Any insight would be appreciated; thanks everyone.

20230403_101530.jpg
20230403_101547.jpg
 
Any insight would be appreciated; thanks everyone.
Alpha do long shaft pots.

The 16 LNG LS has a 20 mm shaft inc the thread, 15mm for the Alpha 9 series but the Alpha 9 also has a 20mm vertical long version.

Alpha 16-LNG-LS-50k log

Alpha 9-PC-ANG-50k log

Alpha 9mm Long Pots – Vertical – Thonk – DIY Synthesizer Kits & Components

Other options open to you would be PC long leg mount

Alpha 16-Long Legs-50k log

Or use a standard pot secured through the body with hook up wire running to the preamp PCB.