Okay, I give up!

I have a '04 Range Rover and the overflow tank on the cooling system began leaking.
I changed the overflow tank (no problem). However, when I tried to reattach the hoses...one of them had vanished into thin air.
I reattached the sensor underneath, the hose underneath and the hose toward the front of the tank. But, the hose in the back???
I've looked for hours, felt around in the engine, looked under the car...

Help! Feeling really stupid and frustrated!

Any help is appreciated,

Pompano[:@]

 

Go to the dealer and buy a new one, shouldn't be a problem. Also make sure your are adding the correct coolant back.
Mike