88891776 refers to an Engine Coolant Outlet Gasket (also known as a water pump adapter gasket or thermostat housing gasket) manufactured by General Motors (GM).
Genuine GM Turbocharger Gasket 12700564
Genuine GM Turbocharger Gasket 55595128
Genuine GM Turbocharger Gasket 55570021
Genuine GM Turbocharger Gasket 12623450
Genuine GM OEM 6259163 Brake Main Cyl Diaphragm Cover Gasket
Genuine GM Brake Master Cylinder Gasket 84417422