hey all, piggybacking on the wheel sizes, wouldnt offset change if backspacing changes? im not sure what the backspacing is on this set, but would these fit if i chose the 40mm offset?

TSW Vortex - Hyper Silver Wheels - Wheel Size & Price Details - 1010tires.com

i think they would look nice on a 99 gt, but would powdercoat to either gunmetal or black color, if possible.