Harman Potentiometers

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I have two boards with same p/n just different revs and they even have different value pots in them so best to verify before ordering on ebay.
The seller info on here is also outdated because you can now order 10x longer life pots “ultra long life” from a different seller. I have them in my main board and backup board and controls are much better than the originals
Can you tell me how to contact the different seller?