I thought it was the burners and ordered four burners. When they arrived I thought three of them were wrong parts so I ordered three others and scheduled a return of three I had just received. I then realized it was not the burner but the diffuser plated on top of the burners. I cancelled the new order, arranged a return of the four initial burners and ordered four diffuser plated. The representatives were extremely helpful; and understanding. I was amazed adn happy that there was no restocking charge of problems with my errors. The new order arrived within three days and everyone is happy. AppliancePartsPros are certainty the PROFESSIONALS they state in their name!!!