Update, y'all. Thanks to all who replied. I think I might have found a solution and I wanted to pass it along to our forum members. Nostalgic Air (you can google them) has a pretty good selection of this stuff. Looks like they sell 2.5 inch defroster hose for $3.80 a foot, and the adapter I need for $5.76. I'll let you know how it turns out. This appears to be a far more economical solution than buying an entire kit (with a bunch of stuff that I don't need) for $50.00 from Classic Industries or Detroit Muscle Technologies. Of course, a longer term solution would be for someone to repop the originals with a very high quality reproduction that would be identical to what the factory installed back in the day. No one is doing this yet, especially for A body cars. I think they'd sell a lot of them, as these ducts are always torn up and deteriorated down by your feet.
