You will need to change all the pilot and burner orifices to the proper size for natural gas usage. You will also need to change the inline gas regulator on the gas supply line.
As I was searching the parts, I realized that the only part you might need to purchase is the inline regulator. Even many of those are convertible. The orifice size for natural gas in about twice that of lpg orifices. All that needs to be done is to ream the ones in the oven to the correct size. If you need to purchase an inline regulator, it will cost around $25.
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