Hi Thanks for the kind words for my site. I'm a proud owner of a 56 Constellation.
Here's the link to the last Martin Bunn you mentioned.https://gus-stories.org/the_last_martin_bunn.htm

More service stations.
https://gus-stories.org/postcards.htm

This is from Andrew Dalen's engine compartment, This is the placement of decal as noted on the blueprint.

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  5667AirCleaner.jpg (130.29 KB)

This is a partial scan of the blueprint.

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  FromBlueprint.jpg (555.61 KB)

Thank you!

This is my current guess but was wondering is anyone here on Packardinfo has a more complete picture of what was actually on the air cleaner.

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  HoudailleOilBathDecalRed9A.jpg (142.88 KB)

This was sent to me from another 56 Clipper owner. It looks like I was off.

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  oem5667OilBathDecal.jpg (154.61 KB)

I've been trying to recreate the decal as used on the 56 Clipper WCFB air cleaner. I was able to get some of the wording from the Packard blueprint as well as the manufacturer. The picture shows my first effort which was a combination of the Packard verbiage and another decal from another air cleaner of the same vintage (1956)

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  HoudailleOilBathDecal6.jpg (140.33 KB)

Trim Code 57

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  TrimCode57.jpg (118.42 KB)

Guy I purchased from was ccbvinnie@aol.com