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I dont think it's as simple as the parts needing to be approved or test fitted. The pre 06 Z4s used an M54 engine as opposed to the N52 engine that the new Z4s have. Also I believe the exhaust systems on the pre and post 06 Z4s is different as well. If it were as simple as just confirming it fits then companies would defniitely want to do the test fittingd so they can adjust their descriptions to fit the 06-07 as well that way they would have a larger market.
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