Need help ID'ing defroster vents for '41

[41woodie]

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I'm finally getting around to putting heat and air on my '41 woodie. For years I've toted around what I thought were the vent cans for it. Started to install them this morning and either they aren't the correct part or I'm even dumber than my friends think I am.
Can anyone furnish a link to a photo or post a photo of the correct parts for a '41 either on their car or on the bench. Any information would be a help. Thnx