Stens 105-148 Stens Muffler. REPLACES OEM: Briggs & Stratton: 297274, 297506, 393615, 493936, 494585, Lesco: 050172. FITS MODELS: Briggs & Stratton 133200, 133700, 134200, 135700, 136200 and 137200. SPECS: Width: 3 5/8Length: 4, Height: 1 7/16, Lo-tone, Bolts not included.