Set of 2, 2 Outer Air Filters Plus 2 Inner Air Filters For Kawasaki 11013-7038, 11013-7039. Same as Ariens 21545400, 21545300: Bobcat 4164576, 4164577: John Deere MIU11747, MIU11748 2 Quality Aftrmarket Outer Air Filters Plus 2 Inner Filters Outer Air Filter Replaces Kawasaki 11013-7038 ID 3-1/2", OD 4", 10-3/4" Long Inner Air Filter Replaces Kawasaki 11013-7039 ID 1-3/4", OD 3", 10-1/8" LOng Also Same As Ariens 21545400, 21545300, BobCat 4164576, 4164577 Also Same As John Deere MUI11747, MUI11748