Holley part missing.

Rebuilding an 4160 1850 Holley.when I removed the secondary metering body, to my surprise there is no thin metering plate. WTF.i got this carb thrown in on the deal,so I need that plate,I have never in all my years,came across this.Or maybe there is a mod done to the secondary.I have bean buying Holleys, rebuilt them and sell.the third pic is the paper gaskit thanks all.

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