I bought blue silicone hose off ebay, and 42 mm sounds familiar. ~3 ft so enough for both my cars forever. Before removing the T-stat housing, have a new gasket on hand and smart to also service the cam chain tensioner since it will be exposed. The spring usually has worn flat on one side. Need a new gasket for that too. Gaskets and spring are avail from P-P. Of course, clean thoroughly before removing the tensioner.

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