The clutch is a bit*ch to bleed. It's best to reverse bleed from the slave cylinder on the transmission.

FYI: for anyone else in the same boat. The hard line is not exotic by any means. The box stores sell lengths of it and will have the one you need. The one I bought was an inch or two too long, a couple S bends and problem solved. No need to order something special for the line.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D