I need to convert back to Natural Gas

Hello group.

My son bought a house and we gave him our old Whirlpool dryer. I had converted it to LPG when we bought it new. Can someone tell me what parts I need to buy to go back to NG? I have searched and I believe that all I will need is the NG Limiter, and NG orifice. But in the Burner parts listing there is also mentioned a NG spring. I just want to order the correct parts at once.

Thank You,
Ron