Amazon.com : Briggs & Stratton 491588S Flat Air Filter Cartridge : Lawn Mower Air Filters : Patio, Lawn & Garden
Briggs & Stratton 5063K with 698754 Air Filter and 273638S Pre-Cleaner - Walmart.com
Troy-Bilt Air Filter for Troy-Bilt Walk Mowers with Briggs and Stratton Quantum Engines, Replaces 491588S, BS-491588S, 5043K 490-200-Y051 - The Home Depot