For future readers, the dealer still sells that tapered fuel hose. So if you don't have access to a cigar hose (as Phil used), just head to your nearest MB dealer. I don't remember the exact price, but it was probably $5-$10. Overpriced, but not such a big deal in the greater scheme of things.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).