LOL. No I don't know everything. Not even close.
The only thing I can tell you is, that on the E46, which the Z4 chassis is based off of, the bars between the M and non-M are interchangeable. In fact, it's a common "upgrade' to change from non-M bars to M bars. And I can tell you that the Z4 non-M bars are thinner, therefore softer than M bars. You'll need the bar and the bushings, since the diameter of the bars are different size.
I suspect it'll fit. With a 90% certainty.
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