74 Duster correct rubber fuel line inside diameter?

Does anyone know what the correct size (inside diameter) rubber fuel line is for my slant six 1974 Duster? I'm replacing the short segment in the engine compartment that connects the steel gas supply line (from the gas tank) to the inlet port of the fuel pump. This segment is about 8 inches long and is secured at either end with Keystone crimp clamps. I looked but can't find this info in my FSM. Thanks!