Inner Air Filter / Kubota K3181-82250Pack Size:1Kubota K3181-82250Baldwin RS3991, Donaldson P780018, J. Thomas 102392, Napa 9968, NHC 261-2392, Rotary 13384, Wix 49968Kubota ZD323, ZD326 and ZD331ID: 1 5/8 ", OD: 2 1/8 ", Height: 9 1/4 "