Old thread, I know... but I've got the same leak and haven't found the O-rings listed anywhere yet. Do you have a part number or size of the O-rings for these lines? Where they standard black buna-N O-rings or were they another color?

I don't want to pop those lines off and find that I've got to custom order a specific size of metric O-rings...

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( E46, 2001 330xi, 5 spd -- Bought @ 105k, Sold @ 143k )
( E83, 2004 X3, 6 spd - Bought @ 83k, Sold to FIL @ 120k )
Current --> E70 2007 X5, 4.8i - Bought @ 98k