Foam pre-filter replaces Briggs & Stratton O.E.M. part numbers 271271, 272490, 272490S, 4111, 5052H, 5052K; Craftsman 24150, Grasshopper 100921, John Deere LG272490S, M84655, PT8999, Toro 272490S, Woods 70302, Stens 100-743, Rotary 19-2797. Foam prewrap for our BS77.