HIPA (Pack of 2) 751-10298 951-10298 Air Filter Pre Cleaner for MTD 11A 12A Series Lawn Mower Replacement manufacturer part number: 751-10298 951-10298 Air filter L x W x HT: 5-3/4" x 3-1/2" x 1", Pre filter L x W x HT: 5-5/8" x 3-3/8" x 1/4" For MTD 11A and 12A series lawn mower Package include: 2 x air filter, 2 x pre filter