The black case will fit Trident and the yellow case is for the OpenROV v2.8 Kit. You will want the following one:
On the right side of the case there is foam (where the charger box normally sits) that is perforated. If you remove this small section, then the controller will fit in there. Make sure to protect the controller as it is not waterproof. When you finish a dive and the vehicle is wet, I would not recommend putting the controller in the same box without a way to keep it completely dry.
If you have additional questions I would urge you to reach out to our support team: firstname.lastname@example.org