Thanks, checked it against national motor regulation, and Max speedo error must not exceed +-5%, and with the amarok set up it will be approx -10.91%. Guess i should try find some 16’’.Have a look on here Will They Fit - Online Wheel and Tyre Fitment Calculator
They will obviously be a much bigger circumference,(which may effect your speedo) but if they do fit, they will certainly fill the gaps in the arches, and more importantly, they will look rather tasty.