Convert from propane back to natural gas

Would like to convert a GE® 30" Free-Standing Gas Range
JGBP26WEH6WW back to natural gas. Bought house from builder who had converted it to Propane. Can’t locate the parts from the lp conversion kit used to convert to propane 4 years ago. I think from reading here I need to replace the orifices but an unsure what I need to do for the oven. Thanks