Fuel Sending Unit

I have a 1970 Dodge Dart Swinger. The fuel gauge does not reach full.
I bought a fuel sending unit to replace the original one.The # stamped
  on the unit is FG69A. Is this the right unit?
I have seen 2 different units, in one the pipe makes a 45 degree bend,
  a dog-leg then straight. The other the pipe is straight back to the
sock.
	To remove the fuel unit requires to drop the gas tank, and I
  do not want to do that until I know that I have the right fuel sending
  unit.
	I have replacement gauges and voltage regulator for the dash
board.

F E Fuller