I think I bought my line, fittings, and flare tool all from fedhill -- http://www.fedhillusa.com/ I can't honestly remember with absolute certainty, though! IIRC, the line is 6mm, the nuts 12mm, and you want a tool that will do ISO bubble flares.

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)