[v8volvo]

You are only looking for the short rubber hose, correct? Not the entire metal pipe?

If you just need the hose, it is simply a short length of standard 5/8" heater hose, available from any parts supply house. You can just get some bulk hose and cut it to length using the existing hose as a template. If you can find silicone hose, this location would be a good choice for it since the most common reason for failure of this hose is oil leakage onto it, which silicone would be less affected by.

Good idea to also replace the rubber O-rings under the hose nipples that mount in the back of the head and block while you are working back there. Any oil leakage will also affect them, plus simply age/time.

Good rubber 1-piece valve cover gasket is the solution to eliminating valve cover leaks.