Air Filter / Briggs & Stratton 399877SPack Size:1Briggs & Stratton 399877, Briggs & Stratton 4103, Briggs & Stratton 399877SEdgewater 010746, ESF 101-044, Foley/Belsaw 5978672, Foley/PLP 101-044, Green Meadow AF246, J. Thomas AF-0030, Kwik-Fix 801044, Laser L3254, Laser 93074, Laser 93075, Landscaper Express 10-0524, Mow More BS41A, Napa 2417, NHC 261-1241, Oregon 30-720, Prime Line 7-02255, Quality 242059, Rotary 2841, Sunbelt SB-2841, Sunbelt B1SB2841, Wix 42417Briggs & Stratton 100708; for 3.5 HP Quantum engines with sidestarterLength: 4 5/8 ", Height: 7/8 ", OEM style blue urethane foam seal, Width: 4 5/8 "