I opened the area up where the swivel piece is located and super glued it. I worked all of 2 hours before my son dropped the headphones and the broke again. The part I need is specific to ordering it...Really simple to repair, I just need the part. You might be able to go here to order the part. I'll check tomorrow to see and provide my results here.
https://esupport.sony.com/US/p/model-accessories.pl?mdl=MDRXB950BT