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If memory serves me, the main line is 8mm and the return line is 6mm. Brake lines come in both 5/16 and 3/8. I think the 5/16 is close to 7mm, but you could mic them to be exact. We used 5/16 for the return line. We converted a T to an S and the T had no return line. Email me if you want more details.
John
'69 911
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