Answer Hello Pam, If the serial number for your unit begins with 22 or lower, you will need to order part number 99002783. If it begins with 23 or higher, you will need WPW10153532. I'm sorry but the first part has been discontinued by the manufacturer and no satisfactory substitutions have been provided. The only way to get the earlier series wheels is to order the complete upper rack assembly W10337961. There is a possibility that WPW10153532 may work satisfactorily. Read More... Answered by AppliancePartsPros.com | Friday, July 25, 2014