Item 03453807 has must read information.
: This potentiometer is still available for service use on P/Q controller p/n's 1600266. The potentiometer p/n 7003997 is to be used on OEM controllers 1600235 and 1600257. 

TX-POT 20K OHM

$21.56
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03453807

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: 1.5  : 1  : 1  : 0.07

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EA
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TX-POT 20K OHM - 03453807