Those brackets were on my 2014 and they are on my 2017 as well.
They could be there to aid in assembly/alignment during manufacture or for wind deflection/harmonics, pretty much anything.
Seeing as this car was designed for regions with lesser quality roads and lower speeds than we're used to it's unlikely to be sway bar related IMO.
Will weld for beer.
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View my fuel log 2014 Mirage SE 1.2 automatic: 45.3 mpg (US) ... 19.3 km/L ... 5.2 L/100 km ... 54.5 mpg (Imp)