Which radiator hoses?

I need to replace the hoses on my 71 400 Duster. Rad inlet (top) is on the driver's side, outlet is on the passenger side. 22" radiator, long water pump inlet. No idea what hoses are on it, there are no numbers on them.

I've been looking at 70-71 cars and it looks like 340 hoses might work if trimmed, but can't be sure. The local parts stores don't have anything for old cars so I would have to order them. I'm skeptical that I'd be able to match up something usable because they don't have anything for old cars.

Does anyone know if the 340 hoses will work in my application? If not can anyone make a recommendation of what hoses fit other than a flex hose?

Thanks in advance.