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Is the PN different because of different final drive gear ratios? Can't remember for sure if the ratios are same or different. From the '06 Z4MC my friend had in the Grand Am GS class, I thought the physical characteristics of the diff was identical, direct swap, no mods as you stated... At RealOEM.com, there is one difference - the diff for the Z4M has a $2.16 o-ring at each output shaft that the M3 diff does not appear to have - so maybe there was a slight redesign. That, or I found a glitch in RealOEMs database.... Either way, I don't think this would affect the fitment between the cars - I believe it is still a direct swap...I'd get others opinion because I can't claim 100% certainty...
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