Oregon 30-097 Air Filter Replacement for Briggs & Stratton 390492 Fits 6, 7 and 8 HP horizontal engines 143400, 146400, 147400, 170400, 171400, 190400 series 3-3/16" OD, 1-3/8" ID, 2-13/16" Height Replaces Briggs # 390492