Chassis code is "SN95" for all 1994-2020 Ford Mustang.
https://www.imcdb.org/vehicles.php?resultsStyle=asImages&yearFrom=1994&yearTo=20- 04&makeMatch=2&make=ford&modelMatch=1&model=mustang&modelInclModel=on&modelInclChassis=- on&mk=&origin=&madein=&madefor=&role=

Except there:
https://www.imcdb.org/vehicle_51122-Ford-Mustang-Concept-2003.html
https://www.imcdb.org/vehicle_404635-Ford-Mustang-Concept-2003.html
https://www.imcdb.org/vehicle_426806-Ford-Mustang-Concept-2003.html

Chassis code is "S197" for all 2005-2014 Ford Mustang.
https://www.imcdb.org/vehicles.php?resultsStyle=asImages&yearFrom=2005&yearTo=20- 14&makeMatch=2&make=ford&modelMatch=1&model=mustang&modelInclModel=on&modelInclChassis=- on&mk=&origin=&madein=&madefor=&role=

Chassis code is "S550" for all 2015-2020 Ford Mustang.
https://www.imcdb.org/vehicles.php?resultsStyle=asImages&yearFrom=2015&yearTo=20- 20&makeMatch=2&make=ford&modelMatch=1&model=mustang&modelInclModel=on&modelInclChassis=- on&mk=&origin=&madein=&madefor=&role=

Except there:
https://www.imcdb.org/vehicle_1455854-Ford-Mustang-Mach-E-1400-2020.html
https://www.imcdb.org/vehicle_1752676-Ford-Mustang-NASCAR-2019.html