These are just like the reflectors on the 08 M5. They're double sided, meaning they're two separate pieces connected to each other (front and back). Be VERY CAREFUL removing them, as I snapped the M5's reflectors while trying to gently remove them. I'm going to have them removed, painted, then snapped back on. It'll look perfect that way.
And Mark, the hole holding the reflector is the same size and shape as the reflector. No plugs will fill that thing.