Adjusting Potentiometer Resistance?

I need to replace 2 pots that are not standard rating on my mobility scooter.One pot is rated at 20K and is used as a variable resistor for adjusting speed control (wiper not used).The other is a 5K which is for forward and reverse options and uses all three terminals.The closest to a 5K is 4K7,would it be possible to connect a 300 ohm resistor in series with the wiper to achieve 5K ?

One pot is rated at 20K and is used as a variable resistor for adjusting speed control (wiper not used).

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The wiper is used! Use one end and the wiper. OR Tie one end to the wiper.

The other is a 5K which is for forward and reverse options and uses all three terminals.The closest to a 5K is 4K7,would it be possible to connect a 300 ohm resistor in series with the wiper to achieve 5K ?

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Use the 4k7. Don't add the 300 ohms. It will work.

The last time I looked, 5k was readily available. Is it a normal single turn pot or a rocker pot?