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Can someone confirm that I have the wrong AC duct on my '81? The center and right AC duct is a thin light weight textured black plastic, probably around 1/16 of an inch thick. However the left duct piece is a thick hard plastic with no texture on it like the other ducts and it is probably 1/8 to almost 1/4 inch thick. It looks like it has been cut in to with a dremel tool or saw to make it fit in to the center duct exit point. Again, just confirming since I think I need to start hunting for new vents.
Center duct with deformed entry point due to the corner be pushing in to the AC box and temp cycled over and over. I will try to fix this but we will see.
Right duct which I believe it correct and original