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I had done the measurements vertically between the top edge of the wheel opening and the outer edge of the OEM rims (all at stock ride height and on a level surface, of course). The front rims are about 15mm inset and the rears are about 25mm inset. If you change the width and offset by these amounts, your rim edges will be flush with the upper edges of the fender wells.
Note the 10mm difference between front and rear. Coincidentally, when you account for bothe left and right sides, that matches up to the 20mm difference in track width per the OEM specs. If you get the same size and offset wheels at all four corners and add 10mm spacers the the rear, you will get the same relationship vertically between the top of the fender openings and the outer edge of the rims. You will also end up with the same track width front and rear. There is another way to go about that with a staggered setup but having the same all around allows for tire rotation (for those who would prefer to be able to to that).
All you need is some back math and the ability to convert between SAE and metric to figure this stuff out, at least until you start playing with changes to ride height and camber. Then you better have been paying attention in geometry class...
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