Here is what is stock for various V12 models including the 599s. Make a drawing on a piece of paper with the ET measured from centerline and you should be able to figure it out. Those fronts are pretty narrow for the size of the rears. 599/HGTE/SA Aperta Five Spoke F 19”, R 20”, 5 X 114.3 mm Front 8J X 19 ET 43.5 mm, Rear 11J X 20 ET 63.8 mm Challenge Monolithic 20”, 5 X 114.3 mm Front 8J X 20 ET 43.5 mm, Rear 11J X 20 ET 63.8 mm HGTE/SA Aperta Five Spoke 20”, 5 X 114.3 mm Front 8.5J X 20 ET 40 mm, Rear 11J X 20 ET 63.8 mm 599 GTO Five V/Ten Spoke 20”, 5 X 114.3 mm Front 9.5J x 20” ET 38.1 mm, Rear 11.5J x 20” ET 63.8 mm F12 Five/Ten Spoke 20”, 5 X 114.3 mm Front 9.5J X 20 ET 48.4 mm, Rear 11.5J X 20 ET 71.6 mm F12 TDF Ten Spoke 20”, 5 X 114.3 mm Front 10J X 20 ET 48.4 mm, Rear 11.5J X 20 ET 57.3 mm 812 Superfast/812 GTS Five Spoke 20”, 5 X 114.3 mm Front 10J X 20 ET 48.4 mm, Rear 11.5J X 20 ET 57.3 mm