Carter AVS Gasket / Spacer help!

I need some help with a stock set up. I have a Carter AVS that I want to mount to a stock 340 cast iron intake. The problem I have is where do I find the gasket / spacer. It appears in order to make the factory choke work, the carb needs a spacer. Correct me if I'm wrong. Any help would be greatly appreciated. Thanks. Dave
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