Lenovo SYSTEM BOARDS 5B21N62819 is compatible in the following Models:

Lenovo ThinkBook Series

ThinkBook 16 G7 IML - 21MS0001AU
ThinkBook 16 G7 IML - 21MS0002AU
ThinkBook 16 G7 IML - 21MS0054
ThinkBook 16 G7 IML - 21MSCTO1WW