I finally got around to installing 2017+ Front brakes on my 2015 Mirage.
2017+ front brake caliper bracket
(you do not need the actual caliper, only the bracket. It may be hard to convince/confusing to anyone to sell you only the bracket so you may have to buy the caliper with bracket as one, just make sure it is off a 2017+ model. The 2017+ brake caliper bracket looks almost the same as the 2014-15 one except it is about 1/2 inch longer/taller to accommodate the larger 2017+ brake disc/rotor)
2017+ Front brake disc/rotor
(the 2017+ disc/rotors are about 1 inch larger diameter than the stock 2014-15 brake disc/rotor = better stopping power and heat capacity)
I had to go through the process of buying the entire caliper and caliper bracket, pads and disc/rotors used off a 2018 Mirage from an online junk yard as there wasn't much info for this upgrade. I found out you only need to use the above parts. You can use you any new mirage brake pads, its the same size. The brake caliper is the same as well.
To upgrade brakes:
jack up car and use some jack stands please
remove brake disc
remove brake caliper bracket bolts and brake caliper slider bolts
remove brake pads
Install new 2017+ brake bracket
Re-install original 2014-2015 brake caliper (no brake bleeding or brake line replacement needed, my 2015 oem brake hoses had plenty of slack for suspension movement )
install new pads
install 2017+ brake disc/rotor
You only need basic hand tools
The perfect opportunity to do this is when you are due to replace brake pads.