The file 'GT86 / FRS / BRZ Rear Speaker Mount 5″ 3D Printer Model' is (stl,step) file type, size is 58.0KB.
Really not worth it to change the rear speakers but if you want to try it here's a mount for 5" speakers, you can redesign the mounting ring to fit bigger speakers as there's plenty of space back there.
Holds well with PLA and superglue
Brackets.stl | 23.5KB | |
GT86_Rear_Speaker_mount.step | 168.4KB | |
Mounting_Ring.stl | 297.7KB |