where to get a/c ducts, 66 coronet

i need 2 a/c ducts from the actual vent (rectangular) that goes to the a/c box (about 3' round).
they are the spiral wound flexible cloth type.
i'll take good used or repops even restored.
for a 66 coronet

tag for if you find them.

Please post an ad in the "b-body pre-71 parts wanted" section.