68 Barracua Heater box resto pt3

I bought the rebuild kit from DM. The only problem is it has a parts list, but no diagram for where they go. I bought the car with the box already removed and disassembled so I have nothing to go with.

I am trying to figure out part:
#4- 1/2"x1/2" x 7" charcoal foam tape strip
"Attaches to heater ore side to seal hinge edge of rectangular inner door"

Huh??? Does it go along the core where there is a big opening in the box? There is no door there or hinge

#5- 1/2"x1/2" x 3 1/2" charcoal foam tape strip
Yep, it sure is....but where does it go?