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
PASSENGER DOOR #2 Door with custom open/close checks Name Middle Passenger Door Custom Check (L:BB_LDoorPax2,bool) Position -2.40 5.66 3.86 Angle 0.00
ENGINE #1 Position -5.76 4.00 2.12
PASSENGER DOOR #3 No door at this position
PASSENGER DOOR #4 Door with custom open/close checks Name Rear Passenger Door Custom Check (L:BB_LDoorPax4,bool) Position -2.10 -17.76 4.08 Angle -9.00
SERVICE DOOR #1 Door with custom open/close checks Name Front Service Door Custom Check (L:BB_RDoorPax1,bool) Position 2.34 14.52 3.80 Angle 0.00
CARGO DOOR #1 Door with custom open/close checks Name Front Cargo Door Custom Check (L:BB_DoorCargoFwd,bool) Position 0.70 10.20 2.40 Angle 0.00 ULD Code BELT
ENGINE #2 Position 5.76 4.00 2.12
DEICER IN Position 2.90 -0.80 3.42
DEICER OUT Position 16.46 -5.28 5.18
FUEL Position 9.26 -1.70 3.88
CARGO DOOR #2 Door with custom open/close checks Name Rear Cargo Door Custom Check (L:BB_DoorCargoAft,bool) Position 0.70 -9.14 2.60 Angle 0.00 ULD Code BELT
SERVICE DOOR #2 Door with custom open/close checks Name Rear Service Door Custom Check (L:BB_RDoorPax4,bool) Position 0.70 -9.14 2.60 Angle 9.00