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I don't have a regular Z4 but from another post on this forum I got the following info on the stock wheels:
18x8 et 47
18x8.5 et 50
Increasing from 18 to 19 is fine. The widths of 8 front and 8.5 rear are the same on the E93. The only issue is the offsets. E93 offsets are 34 front and 37 rear. So, if you put your E93 wheels on your Z4, you are moving both the front and rear wheels outward by 13mm. This will probably put the tires close to the fender lip but probably not rubbing. I can't say for certain, but I think it will work and it will look good.
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