Podoy Lawn Mower Air Filter for Subaru Robin EX13 EX17 EX21 Replaces 277-32611-07 Fit ROBIN SUBARU model: EX13, EX17, EX21 - 4.5HP, 6HP, 7HP Engine. OEM #s 2773260618, 2773261107, 2613260218, 27732618, 261-32601-07 Package includes: 1pc air filter with pre filter