If you did not save the natural gas orifices, then you will need to order those parts. The natural gas orifices include: part WB28K141, 2 of part WB28K5095 and part WB28K5096. You can order those parts from this page:
The LP orifices on the surface burners will need to be replaced with these orifices.
The regulator will need to be converted back to natural gas. The image below shows how to convert that regulator on your model. If you regulator is different than that one, let us know. Some models may have different regulators.
This conversion should be completed by a qualified installer. Contact your local gas company for a qualified installer. You may also find a pre-screened service provider on the
website that can complete that conversion.
If you need more help, let us know.