I need to convert a Rheem RGDJ 07 EAUER furnace from LP to natural gas.

I need to convert a Rheem RGDJ 07 EAUER furnace from LP to natural gas.
That's a statement... what is your question?

You will need an HVAC person to do this. You may or may not be able to do same. With the new computer systems, some are convertible, some are not. If it can be done, new orifices and a gas pressure regulator are needed. Better safe than sorry with a gas heater.