They best way to replace this keyboard is to replace the whole bottom lid with the keyboard attached. You may have to buy a parts machine from ebay.
I did find the [https://www.ebay.com/itm/New-for-HP-Envy-X360-m6-aq105dx-m6-aq006dx-m6-aq103dx-Silver-backlit-keyboard-US/162671952154?hash=item25e001011a:g:cGsAAOSwnHZYT0PP|keyboard] but the teardown video does not show how to replace it.
[https://www.youtube.com/watch?v=KwjcMCScHtM|Teardown video]