Oregon 30-800 Air Filter 5-Pack Replacement for Briggs & Stratton 491588S Includes 5 Oregon 30-710 Air Filters 5-1/4" L x 4-1/2" W x 13/16" H Use Oregon 30-927 Foam Pre-cleaner for horizontal engines and 30-961 for vertical engines Fits 3&5 HP horizontal engines and all 3.5-6HP Quantum engines Replaces Briggs & Stratton 491588, 491588S, 399959