Most of the little rubber vacuum connectors like this on my 190d are brittle and probably leaky. This one in particular is definitely bad. I've done a bunch of searching but haven't found a clear answer. Can I just replace this with a small piece of either 3mm or 4mm (1/8" or 5/32") silicone hose? The places that sell these little rubber deals individually want several dollars per connector. If I could get a whole pile of them for 40 bucks or something I'd bite.

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2010 Mercedes E350 4Matic - 77k miles
1986.5 Nissan D21 V6 4x4 - 276k miles
1987 Mercedes 190D 2.5 Turbo - 3??k miles
1983 Mercedes 300SD turbo parts car
2017 Honda CBR500R - 15k miles
2016 Suzuki GSX S1000 - 9k miles