I can’t find a definitive answer and no pictures on Google, surprisingly.
Please post pics of your cabrio Verbandkasten/Tasche.
The BMW ETK lists 52201859303 as the active number for around 1996-99.
But this is a plastic box and does not fit in the tray on the left.
So this would mean only a Tasche fits, but the numbers of the Taschen do not match.
I hope some here have the original one, or know what the correct one was at the time.