Need help finding the exact part

Hi, I’m working on a Digital Design car amp for a friend and I need help getting the same part. It’s a B20k potentiometer it has 6 pins, it’s blue plastic and has a black plastic screw head for adjustment. Reason for replacing is the screw head is stripped. Thanks In advance.
 

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Would need to measure the lead spacings on the other side of the PCB to find a match, the footprint will vary between types. Alas "B" type potentiometer is ambiguous - best to check if its log or linear with a meter. I never understand how this state of affairs came to be, but A and B meaning log and lin has two different conventions - gah!