My dealer sold me enough for 2 cars for $30. You can also use a preformed hose from a McParts shop, just make sure it has a straight portion that is long enough and cut it down to size, then clamp it REALLY good (it won't fit quite right 'cause it is SAE).

I took off the T-stat housing to replace it on the 240D and the water pump housing on the 300TD. Go the T-stat housing route. MUCH easier....but make sure you have the gasket in hand.

Good luck!

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT