Ford 555 diesel fuel line size

Hello;
I wondered what the original fuel line diameter is for the 1978 ford 555 tlb. Mine is currently 1/4” diameter with 1/4” compression ferrells on each end, however I’m not sure if that’s original (from tank to filter).
(The line that comes from filter to injection pump is 5/16” so I wouldn’t think they would supply that with a 1/4”).

I can not get the original part# D4NN9323D any longer however I suspect that one is 5/16” . I could make a new one from 5/16” line however not sure what fittings for each end should be.
Thank-you.
 

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