I lost my airpods pro Right side ear piece. can I buy replacement for Right side only ?

Yes.

https://support.apple.com/en-afri/airpods/repair/service

Yeah just call Apple they send out a replacement it’s around £85

Yes. See the following from How to find your lost AirPods - Apple Support

If you still can't find your AirPod or Charging Case, or if something is damaged, get the serial number and then contact Apple Support for a replacement. Then learn how to set up your replacement.

You can also learn more about AirPod pricing and service options.

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