Source for fuel sending unit for in-cab tank?

[Jim64]

Hi Folks - my son has a '73 Dodge Custom 100 long-bed step-side. (Was a Colorado Forest Service truck.) It has the behind-the-seat fuel tank. Does anyone know of a reliable source for a new sending unit for this? Seems like it's getting hard to find.
-Thanks!

 

[HALIFAXHOPS]

Try Dantes they might have one shoot them an e mail