LVB460L07

With that little arm ripped off, you're not going to be able to repair it.  You've probably figured this out by now...sorry for the late reply. 

If you want to save $350 or more, you can also carefully remove the sensor, drill out a 1/16 through hole at the center of the rotary arm & stationary portion...then screw the rotary arm back in place with a tiny screw.  I just finished this on mine & it works great.  **Just make sure you have a low profile screw head so it doesn't bind into the silver sway arm.  Also, you want to wallow out the rotary arm hole a little bigger than the screw - that way the screw only holds into the stationary sensor portion.  You don't want the rotary arm engaged w/ the screw trying to turn it.

I kept bumping the "trunk close" button when trying to pull away the trunk lid trim.  If you remove the 2 top right fuses 10A & 5A in the left trunk fuse block, the trunk lights & trunk operation will stop while you work on the sensor.