IIRC the cabrio has speakers in the rear passenger area, not the shelf - maybe those covers/grills etc could be swapped for the standard coupé items to increase the number of places that speakers could be mounted, keeping it oem at the same time
well,, ended up wining this lot on ebay for,, £230.00,,
recon it's not a bad price,, even if i only use the head & changer,, but i'll probably have a go at using it all,, and see what it sounds like,,