I know there is a bunch of info here for taking door panels off, and making a bigger hole, and drilling, etc. I also know there are speaker adapters available in other countries, and I had a hard time finding adapters.
I didn't want to do drill, cut, or otherwise destroy my new car. So I found these adapters made by Scosche. They are available on amazon, crutchfield, and other places. I took a chance, as I found a set for $12.00 on ebay.
Link to Crutchfield https://www.crutchfield.com/S-wvvUhi...-Brackets.html
The eBay link where I purchased my adapters: http://www.ebay.com/itm/Scosche-SAMI...kAAOSwU8hY7nT6
It does not say that they are compatible with the Mirage, but for the front doors at least (as I'm still waiting for the second pair of adapters I ordered) they DO fit, PERFECTLY.
I just wanted share this info with everyone.