BMW E36/7 Z3 Third Brake Light with Painted Cover. I believe the color is Topaz Blue Metallic - Code 364.  

This unit was removed from a 2000 Z3 deck lid.  Fits all Z3 roadster models from 04/01/99 through 2002.  Will not fit the M cars and any roadster made prior to April 1, 1999.  The lens is red.

Very good used condition.  The lights work fine, and structure is good.  Note the central mounting tab is cracked, which is not an issue if you keep the blue cover in place.  If you change it, extra care will be necessary.  There are a few very minor scratches in the original paint.  The paint could use a good cleaning and polishing to look a bit better.  The red lens is in great shape.