Brake lines seat at the end, both double flare and ISO bubble, the length of the thread on the nut has little bearing unless the seat in the part is recessed. Premanufactured brake lines usually come with a long nut on one end and a short on the other.

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1984 300 D runs, interior
1984 300 D light hit in front, RUST, mint/perfect dash, decent interior (see above), parts car
(hate to kill one)
1998 Dodge diesel