Lenovo SYSTEM BOARDS
5B21C21582
is compatible in the following Models:
Lenovo ThinkPad X Series laptops
ThinkPad X1 Carbon 7th Gen - (20R1, 20R2) Laptop - 20R1002AAU
ThinkPad X1 Carbon 7th Gen - (20R1, 20R2) Laptop - 20R1CTO1WW
ThinkPad X1 Yoga 4th Gen (20SA, 20SB) Laptop - 20SA0017AU