My anecdotal research says they are unique for the Z4, though other N54 chassis platforms can be made to work with modification. Like a lot of Z4 stuff, I've not found a definitive answer (pictures or it didn't happen).
I'm hearing similar things in the "outlets" category. This forum also seems near dead with technical discussion (sadly) and I've exhausted the search tool ... ;-)
Thanks all !
Filippo
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