Covert Dryer from LP to Natural gas

I have just aquireda stackable washer and dryer. They are Frigidaire Gallery models. The dryer was converted to LP when new. I need to convert back to natural gas. I have been told I just need to change the orfice back to the natural gas one and I will be good to go. But when I look up at the lp conversion kit it has about 4 parts with it. Do I need to take these parts back off or do I need to just change the orfice. Thanks for any help.