Upper molded radiator hose A/C 273 cars
I went to Autozone and searched through all the hoses they had in stock. I found a hose I think will work. It's the lower radiator hose off a 2006-2010 Ford Explorer V6. It's quite a bit longer than the Dart hose, but if I cut off both ends I'll have a section in the middle that looks like a very good fit.
Here are the various part numbers for the hose.
Dayco 72384
Goodyear 66012
Gates 23364
ACDelco 26602X
The Dayco version has no writing on it, in case you're concerned about visual appearance.
I'll post a picture after it's installed.