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Aguilar OBP-3 installation

I have a little problem with the potentiometers no fitting my bass.

The preamp was previously installed on a different bass.Now i'm installing it on my SR 506. Volume and balance pots were a direct fit but the bass, treble and middle pots are the problem . The nuts and washers of this pots are not the size that I need for this bass. The question is , what are the correct nuts and washers that will work with this bass ? I tested the EMG pots and removed the nuts from those with no success. CTS pots are next.The dude that helped me installing the preamp told me that the size that we need is not a common size that you will find on a regular store, so apparently my best shot i to buy 3 potentiometers of the right kind and size so i can use only those parts ( nuts an washers )
Apparently, the ones that i need are similar to the ones on a regular guitar input jack but a bit smaller than that.

Hope that's clear.

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