Microwave trays may be replaced provided that the model number and manufacturer are both known. Upon presenting the model information to the manufacturing company of the unit, a part number is obtained. A replacement tray can be purchased by taking all this information and shopping around for the best price.
The model number and manufacturer is typically located on the back or inside of the door's edge of the microwave. Not every tray fits every microwave, so it is important to verify information about the part before purchase. Be sure to ask if the seller of the replacement tray has a refund policy.