The Tesla Magic Dock is a charging handle with an integrated CCS1 to NACS adapter.
However, until Tesla opens up all Superchargers to GM vehicles, you'll be limited to using the Magic Dock at specific locations. You can locate these locations using the Tesla app.
You can grab the adapter through the MyChevy app too. Just go to charge settings, then public charging, and you'll find the order link. Don’t forget to turn on the Tesla network in the app—hit your profile, go to charging, and you'll see the option to activate it. Once that's done, the link will let you order the adapter.