Genuine Subaru exhaust manifold to cylinder head gasket.

Camshaft Oil Seal

Genuine Subaru exhaust manifold to head stud.  These are located on the underside of each cylinder head, and are to fix the exhaust manifold in place.  

There are 6 per car, you will need to add 6 to your...

Genuine Subaru Block to Head Dowel.  Used to locate the head gaskets and heads correctly.

You will need to select 4 for a complete engine.