I have just purchased a home that the return air filter grill latches are missing. These are the two latches that hold the grill in place, they are round on one side that you turn to move the holding bar into place to hold the grill. Does anyone know if I can purchase these two replacement latches, and if so where. I really don't want to pay $160.oo for a replacement grill when all that's wrong are the missing latches. Thanks to anyone for your help.