This is a sealed Headlight Motor Gear Case.  It is factory sealed from GM with the gear inside.  It is for the drivers side headlight assembly. 

******You must have the skills to move your electric motor over to this new gear set and case******

Item DISCONTINUED by GM.

GM part # 10351396

Alternate part # 19207407, 19208855, 16530235, 19207409, 19207409

Item is number 18 in the GM diagram.