I should have the info you need to properly install the little thingies back where they belong... And yes, you definitely need hydraulic line. Just reuse the original fittings as they disassemble and you should be good... There is a how-to somewhere on here...

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1998 VW Cabrio
2001 Audi SomeRoad A/T (no air suspension)
2003 Audi DeadRoad M/T (no vroom, for later)
2002 Audi NoRoad A/T (nothing under the hood, being rebuilt)