After, hours and hours of research I never found a replacement sender assembly. So there's four choices I see.
1) do like duner did.
2) Buy the airtex pump part # AFE709IS which comes with the assembly. I've seen em on on EBAy from anywhere from $65.00 to $150.00 plus shipping. Then go to radiator connection and a cherokee 20 gallon gallon tank goes for like $100 with shipping. The only differnce I see is that the cherokee tank is about 3 inches shorter (height wise) and you might need to modify something to hang the tank.
3)Find a used one in good condition.
4)they usually go bad where the hard lines go into the "cap" to the sender, so somehow weld the cracks in the lines.