As I recall you cant get your true build number. The hellcat shares the line with the normal Challengers, Chargers, and the Chrysler 300. The number is assigned as it comes down the line with the other models. Xavier84 is correct in that plum crazy can you give you the build tree for your car, but it will only how many cars are configured like yours. Its really cool to have. In 2017 there was only one other car built exactly the same as mine!