New For Lenovo PC HK Limited ThinkPad Helix Ultrabook Tablet Keyboard Base US Version TP00065K2 - AliExpress
Keyboard incl. topcase DE (german) black/black with backlight and mouse-stick original suitable for Lenovo ThinkPad X1 Carbon 9th Gen (20XW/20XX) - sparepartworld.com
UPDATED: Keyboard hinders Lenovo's Thinkpad Helix 2 — Surface Pro Artist
Keyboard incl. topcase DE (german) black/black with backlight and mouse-stick original suitable for Lenovo ThinkPad X1 Carbon 9th Gen (20XW/20XX) - sparepartworld.com