This left muffler c667.235 zdm b13 is original Ducati and has spare part code 57410354A. After careful checks and inspections our technicians have found the following conditions: good conditions - signs present - no dents - no breakages - to confirm compatibility please compare the code shown on the internal part 57410354a (see last photo). This left muffler c667.235 zdm b13 is compatible with the following Ducati models: monster 750 1996 2001 / monster 900 1993 1996 /