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440 V8 breather grommet

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Is there only one breather grommet for a 440; namely, P4529882? Does this grommet work for both stock and cast aluminum valve covers? The catalogs say it works with cast aluminum valve covers, but don't mention if it will work with the stock sheet metal valve covers.
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From what I have found with the grommets is, the space between the two halves have a different gap. Aluminum covers are about 3/16ths to quarter inch thick and the stock valve covers are about 3/64ths. Most of the parts places have the different ones.
 
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