To widen the search for anyone wanting the case it had differing versions. It was also made for the MGF/TF and the Rover 75. Both brands owned briefly by BMW so kinda figures.
The differences are:
The BMW case had Z3 moulded into the lid (recessed) but no doubt they also emerged without.
The MG version had a little stick on MG badge by the handle but otherwise the same (but bear in mind the actual rack for the MG is differently shaped).
The Rover 75 had a more squared off flatter top.
Rimmer Bros were selling the cases at one point, not sure if they still do.
I have a Z3 embossed example, a plain example and a MG example. All fit the same rack. Also have the blanking plugs for when the rack is removed in plastic, black metal finish and stainless steel. Managed to obtain a brand new black finish rack with all fitments, still boxed, from a company some years ago for £130. Also have the stainless rack with bootlid and stainless blanking plugs from ebay for £67 a year or two ago. Granted they don't come up often but it's a case of watching.
@Bez was simply expanding on interest from WEZ1963, why people then start decrying the notion of the rack/case arrangement I don't know. If it's not for you then pass on by. Like
@Bez I too like collecting genuine BMW accessories and yes I probably am sad. The case does look cool though and is all well made, watertight too!
. Great collection, by the way... very admirable!