no metering plate

So, what's the thin sheet metal plate called? "metering separator plate?"
I guess its called a "Secondary Metering Sealing Plate"!

Only pic I see is Post 6 and thats a plate. Goes right on gasket. If there is a foil thin shim (?) that goes between this plate and the gasket, thats news to me. Must be new? It looks like something they dreamed up with the new gas as the gasket did the job before. All the notes say its for "with power valve cavity on secondary side" so it may be a 'fix' for sub standard sealing with methanol and a gasket alone.
HOL- 108-122 Holley Carb 4160 Secondary Metering Sealing Plate
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