Defroster Tubes

Anybody know of a place to purchase defroster tube hoses for a non-a/c Duster. These are the tubes that go up through the dash from the heater core & fan housing to your vents in the dash for defrost. I know I will hardly ever have to use defrosters being in California, but I would still want them operational. I tried a few boneyards and they were junk. Tried Paddock & Year one and no one carrys them. Any ideas, some shops said to try to make my own, I could do that but would prefer correct equipment. 8)