Try a Parker store, they should be able to fabricate a hose for you if you bring in the original.
You may need to use an adapter or two if they can't supply the correct fittings on the replacement hose itself.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022