Some of those fasteners back there are removable plastic rivits, similar to the ones below:
These need to be removed when wanting to delete the spade under the light.
Near the front of the seat, you can access them through the two large holes in the seat fairing. In the rear, there are some you can access by removing the bolts and then pulling on the tail light/plastic assembly to remove it down off of some retaining clips (hard to explain over the internet).