Below are the coordinates that align GSX with the BlackBox Simulations Airbus A321. Just input these coordinates into the aircraft settings in GSX. If you have any issues or find better coordinates, please post them in the comments. Thank you.
----- Airbus A321 -----
NOSEGEAR Nosegear Distance 14.26
PASSENGERS DOOR #1 Door with custom open/close checks Name Front Passenger Door Custom Check (L:BB_LDoorPax1,bool) Position -2.36 14.52 3.76 Angle 0.00
CARGO MAIN DOOR No door at this position