I have been told by the MB parts guy, although I have not verified this for sure, that the new MB fuel hoses from the dealer are viton lined.

I have replaced the original hoses all with the supposedly viton lined stuff from the dealer last year - no sign of leaks or problems thus far.

But if there is a good mcmaster equivalent found Id love to know about it. It's expensive guessing game to find the right hose from McM-C :-)

dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car