From where are you getting your information?
704-48205-R1-00 is the 704 control box without the neutral interlock mechanism.
704-48205-T0-00 is the 704 control box with, repeat with, the neutral interlock mechanism
Well what Yamaha 5 HP model was given as being the equivalent of your Mariner branded built by Yamaha 5 HP model?
What Yamaha thermostat is shown for the Yamaha 5 HP model that was given as being the equivalent of your Mariner branded built by Yamaha 5 HP model?