???????Going by your title, if you're asking about a flat tonneau cover that covers the passenger compartment when the top is down, I haven't seen one for a Z4. I used to have a tonneau for my old MGB, where you could also zip open just the driver side for driving, but in all honesty I didn't find it that practical and don't remember ever using it! If it was threatening to rain, I'd put the top up ...
An MGB with Tonneau (not mine!)
I could see one being somewhat useful for a basic roadster that had no convertible top, but otherwise ...? :dunno:
Thanks, I guess that's why I couldn't find anything for a Z4 with that description! The title threw me, as a 'tonneau' cover is actually for the seating area - I guess this is for the 'boot' of the seating area.... it says he has a 1997 Z3