Did you remove the entire panel from the rear hatch to run the wires? Or were you able to fish the wire through with a coat hanger or something while prying back the panel a little bit? I hated removing that panel when I did the RVC so want to avoid doing it again.
How is the fit and finish of the lights compared to your OEM lights? I also don't have the rear fog light switch so I would re-wire it so that they are reverse lights like jhstl did above.
I did indeed remove the entire rear panel. Interior trunk trim completely out, and then also I got behind the black panel where the seatbelts kinda come off of (just undid the screws towards the back of the car to pull it back a bit, thing where your trunk light is mounted on one side). You do hae to pull some of the narrow interior trunk trim to get at a screw holding that black piece in, but just partially pull on it at the top where it meets that piece and it comes right out easy. Once those are partially out, I pulled the gray/white trim out on the sides of the trunk as well towards the rear only, this allowed me to pull the wire from the rear of the light up towards the grommet in the trunk with relative ease.
I used some 3D printing filament since we have printers here, but normally would have used a coathanger, to fish the wire through the grommet. Figured out you could pop the connector free from the wires, this leaves more room in the grommet to pull the wires through. Grommet should also be squeezed together as much as possible to shorten it and get the most space in there for the wires.
After that its just tucking everything back in. I honestly don't know if you could get that wire through the trunk without removing the back trim, especially where it gets thin around the glass. This is why I chose to just pull it all out to make it easier to maneuver through the tight spaces.
I read about fitment issues but these went in with a breeze once everything was lined up. There is a slight gap between my trunk lid and the outer tails, but I do have my trunk hatch pistons reversed to pop my trunk open when I hold the open trunk on my key, the pistons reversed puts more "open" pressure on the trunk so it is likely that that is causing the gap, and not the lights themselves.
Have not taken it through any washes yet since I just washed it before these went in, but I did check out the seal between the lenses and the housing and it all was glued/melted together well. The area I would be concerned about is the padded areas on the back of the lights where the wires run though (you'll see what I mean when you pull the tails), but I think as long as its lined up properly it should be fine. I'll update once I wash it and see if anything changes.
Also, you are not able to see these tails from the side at all at night, they don't broadcast light around the edge of the back of the car like the OEMs do. NOt sure if tails need this in the US but it caught me off guard while checking it out at night.
Hope this helps!
EDIT: Worst part was getting the trunk lining back in, the edges where it meets the other smaller narrow trim piece need to pop in correctly or else it won't work. Used some brute force before brains and bent the plastic but I got it to fit back ok after I played with it a bit.