Shift Gears From FEBO to FABO.... Hello from 03HDFB!!

Adding a light?
In the trunk, look to the driverside for a tab that the switch goes into. When the switchs plunger is released upwards, the circuit is made and the light goes on. There could be a open connector there already for the hot wire for the switch. If not, you'll have to tap a wire somewhere to feed electricity to the light.

The light itself gets mounted ether in the trunk lid (wire runs inside the trunk lid to the plunger switch) or in a corner of the trunk. Consider putting it where ever you want since your adding it in. Or even two or three lights. Just make sure it turns off when the trunk gets closed.

Same for the glove box. The mounting point should be clear of the cardboard liner or any other material that could catch fire. Light bulbs are that hot and the (extra) dry interior padding with or loose papers can go up in flames.
The bulb could be in a housing. I'm not so sure how it gets done year to year and how your year car is.