K4003 improvement and potentiometer

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So I have this kit at home and I'm thinking of improving it. I read that Panasonic FC capacitors are highly recommended and not too expensive. Is that an OK choice?
For potentiometer I was thinking VISHAY SFERNICE - P9A2R100FISX1503ML - POT, LOG DUAL 50K Is that OK? Or I need double 22k as it's written in manual?
 
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