Lenovo SYSTEM BOARDS
5B21C87255
is compatible in the following Models:
Lenovo ThinkPad X Series laptops
X1 Extreme 3rd Gen type 20TK 20TL Laptop (ThinkPad) - 20TKCTO1WA
X1 Extreme 3rd Gen type 20TK 20TL Laptop (ThinkPad) - 20TKCTO1WW