For Lenovo ThinkPad X1 Carbon 2nd Type 20A7 20A8  touch screen models &

Lenovo ThinkPad X1 Carbon 3rd 20BS 20BT touch screen models only

This Rear Cover Upper Case/lid is for the thicker touch screen panel versions X1 Carbon 2nd/3rd Gens only

This rear cover has 3x brass screw ferrules either side (non touch versions have 4x brass screw ferrules either side)

Do a visual check of exactly what your rear cover is before buying to avoid ordering wrong part.

Thanks for looking :-)