Jetson xavier nx 3D model files

Hi,
I am searching for the 3D model or step file ,mechanical design of jeston xavier nx developer kit.One of the file i got from nvidia download centre found as little mismatch with xavier nx board.could you please provide the correct mechanical files.

Do you mean the STEP model of P3518 https://developer.nvidia.com/jetson-xavier-nx-developer-kit-3d-cad-step-model-p3518 ? What is the “little mismatch”?