Dave,
I have been looking at all my original photos (about 2000) of cars and I have come to the conclusionn you are right about the AC cars having that specific hose. I have a photo of my Charger, which my dad bought new, with that hose on it and I know it was original-FOR A FACT! I dont have a lot of my photos in digital but I have included one of an original Challenger-I know the owner and he bought it brand new. Look a the upper hose (it's a little chopped off). It too is like the hose you are stating is correct.
As far as a part number, Im not sure but it looks the same as the HEMI upper hoses. I have included some photos to ponder. Both HEMI cars are low mileage very original cars. Both use the same shaped hose but end in 2 different part numbers (186, 230) which I have found to be common on HEMI cars as I have done a lot more research on them than AC cars. Once again, I think solid research can prove some part number books wrong!