Derek Soares wrote on Apr 29^th, 2020 at 10:48pm:

Hey guys, if you know how to make GSX profiles/configs could you please drop me a dm on discord. It’s really annoying how none of the GSX vehicles work with the 767! My discord is: Derek Soares#6969 I appreciate the help guys!

You just click edit aircraft in the menu, then move things around with your arrow keys and stuff using the 3D viewer. It's all in the GSX manual