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The new defroster plenums are made from plastic and not the original cardboard (if yours was even still in place). The plastic doesn’t look 100 percent correct, but it works better and will last forever. Besides, by the time you install your carpet and possibly A/C, you’ll never see it.
1966 Mustang Project: Heater Case Rebuild

 The new defroster plenums are made from plastic and not the original cardboard (if yours was even still in place). The plastic doesn’t look 100 percent correct, but it works better and will last forever. Besides, by the time you install your carpet and possibly A/C, you’ll never see it.  View Related Article

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