3D-printers come to the rescue.
Backbone Adapter for iPhone 13 Pro and 13 Pro Max 3D Printed READ
Backbone iPhone 14 Pro Max Adapter Fix - Best iPhone Gaming
Backbone Controller Official iPhone 13 Pro / Pro Max Adapter
It works! : r/Backbone
Backbone iPhone 14 Pro Max Adapter Fix - Best iPhone Gaming
Case-compatible modded, Backbone color-matched, 13 Pro/Max adapter
Backbone's free adapter makes it usable with the iPhone 13 Pro
Apple iPhone 15 Pro 128GB White (White Titanium) MTUW3QL/A
Backbone iPhone 14 Pro Max Adapter Fix - Best iPhone Gaming
BACKBONE One Mobile Gaming Controller for iPhone
Backbone Adapter for iPhone 13 Pro and 13 Pro Max 3D Printed READ
Backbone Made a 3D-Printed Adapter, So Your New iPhone 13 Pro Will