Non A/C Heat Duct Help

[Ole Blue 71]

Hi,

Does anyone know where I can get heat duct for a non A/C truck? I pulled mine apart on my 72 to remove 30 yrs of mouse nest. The bottoms of the 2 metal ones have rust from mouse piss and I can't seem to get them clean. LMC does not even show these parts in their diagrams, only the A/C ducts. For sale forum does not have any either that I could find.

Or, if you know a good way to clean these so they are useable, I am willing to give that a try as well.

Thank you,