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I picture that you are talking about the plate that goes inside a potentiometer. It is covered with a substance that yields different resistance values, depending on how far apart you place two contacts.
I have never seen such a plate available by itself. I suppose you will have to disassemble a potentiometer in order to get one.
There are rheostats, made from resistive wire, and a sliding contact. This is not a plate, because the wire is in a coil.
You can obtain lengths of nichrome wire (or other resistive element), and run a sliding contact on that, to obtain different ohm values.
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