Pulled the trigger and the install instructions are terrible. I think originally they weren’t going to ship the JL with the gap cover. The instructions say it’s in the box and talk about unbolting the rear seat. You need to cut holes in the seat backs and remove the gap cover and cut files in it to attach everything. I gotta admit though it’s pretty nice.
The gap cover is held into this metal plate usin these little pain in the ass 1-time use clips. They’re not supposed to be pulled back out easily so inspect them before you try to put it back in. They get bent and make it impossible. You can see a few of them stuck in the sheet metal still.
This is the back of the gap cover. You cut the circles out, add the plastic retainer rings, then put the cover back in and snap the actual cargo mat to it. Not super well illustrated in the instructions. Or I’m not as smart as I say I am, probably the later....