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Technically, there is not a kit for natural gas conversion. A kit was used to convert the range to Propane. Those steps will need to be reversed to convert the range back to natural gas.
NOTE: The conversion of this range from Propane back to natural gas should be completed by a qualified installer.
There are many steps involved in converting this range back to natural gas from Propane. The gas regulator will need to be converted back to the natural gas configuration. The stove top burner orifice hoods and oven orifice hood will need to be switched back to the natural gas hoods.
Here is the step-by-step guide for going from natural gas to LP that you could use for reference: searspartsdirect.com/diy/repair-guide/how-to-convert-a-gas-range-to-operate-on-lp-gas
Example for model 790.74439810: searspartsdirect.com/model/1bvodfow6v-000582/kenmore-79074439810-gas-range-parts
Once you have entered your full model number on Sears PartsDirect, click on the Burner diagram. As an example, for model 790.74439810: c.searspartsdirect.com/lis_png/PLDM/R1809069-00002.png
On this model, you'll see that the burner igniters are labelled as 11, 11A, 11B, 11C, 11D. Match those with the orifice diagram numbers (44, 44A, 44B, and 44C) as shown in the boxes at the left of the Burner diagram. On the right hand side, you'll see the location of each burner on your range. The parts are listed below the diagram on Sears PartsDirect.
For help with parts, call Sears PartsDirect at 1-800-366-PART. For a professional repair, call Sears Home Services at 1-800-4-MY-HOME.
Hope this helps!