How to replace side buttons of the Pixel 4a?

I've recently been having issues with the side-buttons. Things like volume up being maxed out without being pressed, or the power button double clicking (or more). I assume this is an issue with the side buttons, but I don't see a guide or parts to do the repair on iFixit.

Where would I get the replacement part, and what guide(s) get deep enough in the phone to do that repair?