4160 750 holley metering plate spacer? Missing it

Hello I was replacing some gaskets on my 4160 holley 750 carb 3310-6 model and when I watched a video on you tube of a 3310-2 version it had an extra gasket and metering plate spacer? Not sure if I’m missing it or my version of carb doesn’t have one? See pic off you tube showing the metering plate, a paper gasket, the metal spacer part and then the blue gasket. My carb never had the paper gasket and metal spacer part.

should I be looking for this part and what exactly is it called? 8A7ED2B5-91FF-4369-831B-C5501D33B9D3.png