Just cut the door. We put 2 pairs of TS-A1685 ($$95 total) and it made all the difference.
On fronts you need to make adapters otherwise they will touch windows. On rears there is enough depth to screw them directly. Since you have to have them you may use 1/2" plywood and then there is no need to cut door.
Alternatively if you don't want to cut doors you can buy an adapter (the ones for other Mitsu also fit) or use OEM speakers to make an adapter.
View my fuel log 2015 Mirage DE 1.2 manual: 46.4 mpg (US) ... 19.7 km/L ... 5.1 L/100 km ... 55.7 mpg (Imp)