I'm restoring a 64 valiant and the original hoses were mostly descintegrated so I searched at my work, I work at NAPA, and found part # 813-1373 that is 50mm large and 18-20" long. it's actually pre-heater hose for engines

It fit tightly on the heater box outputs and fit inside the pipes on the dash. the drivers side I had to extend with a little piece of the original hose but it worked

just thought I'd post that up in case anyone else had trouble and couldn't find NOS ones or didn't feel like paying the prices. these run around $5-10 each. Just trying to give back to the community that has helped me countless times

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currently restoring a 64 valiant