Shocking the amount of damage and debris from the glass inside the car. Really gutted for you and hope it get's fixed without too much expense & hassle.
If Dedman can't help you out with the plastic bit for the rear strut brace cover I'd try giving ZmanAlex a PM to see if he has a pre-owned one off an old Zed. Hope that helps and good luck.
EDIT: Have a look at this link for parts; http://www.350z-uk.com/topic/72276-breaking-breaking-breaking/