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Part number for the seal between the air cleaner duct and the throttle body 4.3L V6


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https://www.gmpartsstore.com/-parts/gm-engine-air-intake-hose-adapter-25171042

 

This is the rubber that connects the two together, which is what seals the system from allowing dirty air flow and forces everything to come from your filter. The gaskets are likely just to keep the rubber from molding/sticking to the actual metal parts of your TB.  You can just take those gaskets to napa, or a place that sells gaskets and they can either look for a size like that, or you can just purchase some gasket material and trace out the hole size and cut your own. 

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