Oregon 49-045 Oil Seal Replacement for Briggs & Stratton 391086, 391086S 1-3/16" ID x 1-11/16 OD x 1/4" thick Mag side 10-12.5 HP engines, Mag side 14, 16 and 18 HP engines For 8 HP, PTO side 7-8 HP engines Replaces Briggs # 391086, 391086S