Where to buy a new Fuel Sending unit.

Here is a picture of the original sending unit that I removed after I lowered the tank yesterday. The car I'm working was bought last fall from a friend's estate. It has been parked and in storage for the last 40 years. A real time capsule. I drained out about 4 gallons of the most ill smelling gas you could ever image from the tank. Inside of the tank is loaded with soupy rust.