valhalla 4771
- Reaction score
- 5
- Thunderbird Year
- 1957
I'm installing a reproduction heater plenum from Hills. There is one hole on the plenum about midway on the right edge (see photo) that matches up with a hole on the heater box. The heater box has two other holes on the left side, one at the bottom corner and one a few inches higher (see photo). Seems like something must have been attached, but my manuals don't help me. What goes here?
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