LR Front Footwell Lamps - what additional parts are needed?

[nlfbt8]

I've recently been poking around under the dash of the LR for various reasons (see my recent posts), and this has led me to the installation of the footwell lamps. I've searched the threads on here, which do provide some information, but there seems to be something that I'm missing.

I've found the grey wedge bulb holders (connected to the loom) without any problems, and on the drivers side I've found the hole in the back of the little parcel shelf that the bulb holder connects to. However, on the passenger side I cannot for the life of me work out where the bulb holder is meant to attach to! At the moment, it is just dangling down, swinging in the breeze. In previous threads, people have mentioned ghia bulb covers and trim, is this what I need?

Someone also mentioned that after finding the bulb holder, they simply pushed out the pre-cut hole in the felt(?) underneath the glovebox, and attached the holder to that. Well, the only felt like material that is under my glovebox is my floor carpet! Am I missing something? Is there supposed to be a piece of trim that attaches between the bottom of the glovebox and the firewall? Because at the moment, if the passenger lifts their feet directly up, they will kick the heater blower.

I'm lost ... used: