WWAN Card for X1C9 Choose carefully if this is for X1C9. It might not work because of Whitelist.
5A31C90391 WWAN Antenna Found on Taobao https://item.taobao.com/item.htm?id=809948557523
C-Shell With SIM Slot. Choose an empty shell, such as the picture above, or a shell with a keyboard https://item.taobao.com/item.htm?id=808710967918
5M11C90397 D Shell for WWAN (There's something like tin foil on the antenna… have to buy it??) https://item.taobao.com/item.htm?id=817152949290
5M11C90393 SIM Tray https://item.taobao.com/item.htm?id=712332859796
Forget to order this..
Lift-off back cover
Remove Battery
Remove All Parts and prepare new shell
Unscrew a fuxxing keyboard…..
And move to new shell
Move all parts and add WWAN Card and Antennas (I Forget to order screw for antenna and Antenna Cable on touchpad..
Works