Panasonic NN-CS88LB & NN-CS89LB Microwave Glass Shelf - Z0621CH00BPPanasonic NN CS88LB and NN CS89LB Microwave Glass Shelf Models that this part fits : NN CS 88LB, NN CS89LB This glass shelf is approximately 340 mm x 260 mm and is designed to sit on the wire rack or in the base of the oven. It is not designed to slide into the runners like the wire rack and enamel tray do. If in doubt please refer to the microwave user instructions about where it is used and on what functions.