its all a simple question of maths, et is the distance from the centre line of the wheel to the mounting face, for example stock wheels, 6
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& 7 et 45, so the fronts are 3" from the centre to edge with the mounting face 45mm in, so in affect the rim of the wheel sits 30mm from the hub
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(3"
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- 45mm), the rears would sit 42.5mm from the hub
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(3.5"
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- 45mm) for 8" at et 10 you'll be looking at 4"
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- 10mm which is 90mm so the rim would sit 60mm further out at the front and 47.5mm further out at the back, spacers wont help as they're designed to help with suspension clearance on wide high offset wheels, IMHO you'll need wider arches or wheels with higher offsets, also if you're going staggered its typical to run thinner front wheels to keep the handling sweet