You probably started off with a Z3 Roadster and ditched the hood (and hopefully made a few quid on the deal). Now you just inherited a lovely parcel shelf that none of the hoodies have, congratulations. We use these simple fibreglass boxes to make up the two sides bellow the headlining panels. Trim them to your taste and, they are geat for mounting your rear speakers in too. If you use our glue in speaker mounts (https://grassbankconversions.co.uk/product/speaker-mounts-pair/) the OE BMW speaker grills are a direct fit and blend nicely so you have to look twice to see them.  Two birds with one stone!