I buy the plastic vacum line in 5' or 10' lengths from peach parts ,ebay or ******** az .you go thru alot of it on these cars it breaks like uncooked spagetti! I use a little crazy glue to hold it in the rubber hose ends it goes into because those are usually old and lose their elasticity I noticed they kept falling out of the rubber hose ends,till I got around to replacing those also. It is like opening a can of worms once you start touching these old brittle things

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88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg