I measured the pipe nuts and brake line with a proper metric pair of calipers and here is what I have:

A) Brake line is 6mm
B) Pipe nuts are 12mm, 20mm overall (including flare)

You need a tool that does ISO "bubble" flares.

Fedhill has the stuff, but it is really pricey. I'm looking around for alternate sources.

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1984 300TD