You don't have to unzip the MX5 glass window, you just fold the roof down. There is a gusset at the edges that allow it to fold. I don't see why the gusseted rear window section couldn't be fitted into a Z3 top.
I have just measured my daughters MX5 rear window.
The window 85cmx37cm and the bottom edge of the window sits 12cm up from the rear panel.
The parcel shelf that it sits in when closed is 41cm deep and 36cm deep at the edge of where the glass window sits.
I don't have my Z3 here to compare as it is at the painters. Does anyone have one to hand that they can measure?
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