Hello, I’m probably a bit late here but hopefully this complete guide on removing/installing all types of keycaps will help people in the future. The guide includes the spacebar too:
[link|https://macreplacementkeys.com/guides/how-to-replace-key-caps-and-butterfly-clips-on-the-macbook-pro-2016-2018/|How To Replace Key Caps And Butterfly Clips On The MacBook Pro (2016 – 2018)]