What’s with the extra hole on the mount? Not seen that before?
You’re missing 2 of the shanked nuts btw, should be three of those for each turret (unless not pictured) :wink:
Modified for the camber bolt on the Z4? That’s cool just not seen that before hence the question, was out of interest.
With the nuts just pointing out it should have 3 shanked nuts and 2 flat ones as opposed to the other way round as per your picture. The flat ones are for the brace itself to attach to those mounts. Only mentioning as those shanked nuts are expensive
Should be 6 x shanked nuts, and TIS says they are not reuseable, up to you if you believe that...
As andy says, they are about 8 quid each from bmw.
FWIW I wouldn't install an M3 strut brace on a Z4 even if you can 'make' them fit, they are quite different to the Z4 version when you put them side by side, again just my opinion!
No reason why it won't fit a non M, here's an expensive one on ebay. https://www.ebay.co.uk/itm/284441549164?hash=item423a09996c:g:xz0AAOSwoYdhNp4S