This is a brand new muffler. The specs are as follows: B Gasket included. B Low tone, square, bolt-on-type. B Fits vertical and horizontal. Length 4.065" Width 4.25" Height 2.5" Replaces part numbers: AM100310 JOHN DEERE 105-155 STENS 1283 ROTARY 35-014 OREGON 391313 BRIGGS & STRATTON 692304 BRIGGS & STRATTON Thanks For Your Business!! 35-014