I specifically said use the short Mercedes vacuum hose because it is very stretchy to fit over a hose that is twice or maybe even 3 times its diameter. It's unlike any vacuum hose that you buy in auto parts stores.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

That is beyond my knowlege because I have never bought any new ones from the Mercedes Dealer.

Silicon Vacuum Hose will also do as you said concerning expanding to a large size range and not crack and it also will deteriorate like the Rubber ones do.
It is great Hose to use on your Hand Held Vacuum Tester/Mighty Vac because it can be expanded over different size connectors and still return to the original ID.

However, it might be bothersome that it is generally found in orange, blue or yellow at the Local Auto Part Stores.
They make it in black but I have not seen black selling in the local Part Stores.

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84 300D, 82 Volvo 244Gl Diesel

That there's not enough slack in the existing hose to make the fitting. Once you get the broken segment off, utilize a candle flame to GENTLY soften the tube and put a little soap on the fitting. Worked for me.

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1985 300D 172,110mi and goin' strong