The set I installed is an old Pioneer set made for VAG cars with no mounting holes. The OEM set on my car had two mounting holes spaced 110mm apart. I printed these adapters and used RTV to bond them to the Pioneer set. Then I simply put on two U-nuts that were already on the car's mounting holes onto the adapters and proceeded to screw the new speakers onto the car's dash this time from below to allow extra clearance for the adapter+new speaker.

This should work for more Suzuki models using the same mounting pattern.Mine were installed at the front however this should also work for the rears as they're identical in my Ignis Sport.