No stupid questions here ... everyone here is to help teach and learn.
So, to understand you are asking how the 16s fit our cars?
Well the 17s have quite some gap from the Caliper to the inner side of your rim. The 16s will close that gap more and still be able to clear the Caliper, rotor and brakes.
When I get mine in I can take a photo and show you.
Hatch Nation Member: #147
R.I.P - FELLOW FF MEMBER, IZZY, BLK2k3GTS, will always be remembered. We will compete on a different course again one day.