Whirlpool in-wall oven rack, size 17 long X 16 wide

I am looking for a baking rack for a Whirlpool in-wall oven. I only have one baking rack and I need a second one for baking other dishes. The house I moved into only had one baking rack. The appliance companies told me that that particular item is no longer available/discontinued. The model number is RDE1100W2 and the serial number is M04401040.