They're a little tricky.
The unit is fully sealed with wires coming out thr back, there's also a piece of plastic on the back that may be used to clip into the car they are designed for but it's not much use to you.
The front clear section has a lip all the way round which overhangs the back section, but it's not equal it's offset, more overhang at the top, about 4mm than the bottom which is about 2mm.
I wanted to set them deep inside the opening so to avoid any damage if you slightly bang the bumper so the only real method available to me was to cut a hole and hope for a push fit.
I cut a paper template of the back and marked it on the bumper. I drilled a series of 20mm holes and then used an hacksaw blade and file to open it out.
View attachment 100052
When I was happy it was something like I filled around the hole full of clear exterior silicone and also around the lamp itself and pushed it in, wiping off the excess.
The first one I did I cut the hole slightly too big and so aired on the cautious side with the other.
As for the wires.
Take off the internal covers in the boot to expose the bulb holders.
I used the grommet that the sunroof tubes go through which you can see from underneath the car, pull out the tube, feed the wires through, and reinsert the tube.
***Not sure if none sunroof vehicles have the grommet***
If you get to that stage it's just a case of identifying the correct wires and tapping off them.
I can talk you through that bit if you go ahead.