I would say spacers. Not being able to clear those small brakes is just the wheel not fitting. I would really evaluate before going forward with this while you can still sell them before you start making changes for them to fit. Even without spacers the front track is going to be a good bit wider than the rear. I know you are probably excited about the wheels but if they don't fit, they don't fit.
x2, however how would the front TW be wider than the rear? the offsets are the same on the wheels (I'd assume) as are the TW's. Besides, he's already gone through the motions of destroying the inside of his fenders for these wheels, he may as well use what he wants.