Stens Outer & Inner Air Filter Combo Kubota ZD323 ZD326 ZD331 Zero Turn Lawn Mowers K3181-82240, K3181-82250 FITS MODELS: Kubota ZD323, ZD326 and ZD331 REPLACES OEM: Kubota: K3181-82240 and K3181-82250 Inner and Outer Air Filter