I put 1/8" Viton return hose from ebay on my 1985 300D a few years ago. Still looks OK and soft. I did get a leak at the #5 stub, but right after I had cracked the injector nut, so apparently tore it w/ the wrench. Previously, I had woven hose stamped "Made in Germany" and it seeped thru everywhere after maybe 4 years. Don't know the current hose truly is Viton, but a duller gray than typical shiny black of rubbers like nitrile, if that means anything. From China, but doesn't always mean phony. Having the woven look isn't essential to me, and a smooth surface is easier to clean.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans