Rebuilding heater box, replace core?

Seals from DMT. The ones with arrows are the ones that I determined might be used on a '67.
Cardboard is a little thicker than original but cut is perfect match and fit is good.
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The circular tan gasket is in case you remove the motor from its attachment plate as Dana shows in different thread.
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As mentioned in the previous post, the original temperature control door seals may have been a thicker yellow open cell foam.