Most places stock the NA gaskets separately from the grommets.

For the SC gaskets they typically only come with the grommets.

The more expensive gasket looks like its for a gen 1 small block chevy.

Not exactly what you need.

You want this: Buy Felpro Valve Cover Gasket Set VS 50080 R at Advance Auto Parts

and this: Buy Felpro Grommet Set ES 72833 at Advance Auto Parts