If your car doesnt have fog lights, you can modifiy the blank to hold an MR16 LED bulb.
MR16 bulbs are 12v, so there is no need for a convertor, it just a case of running the two wires to the bulb.

These are the kind of bulbs you need.


A quick search on ebay and you'll find these.

Other items you'll need include

3mm HSS drill bit
45mm Saw Bit
Torx driver bit
Heavy Guage wire
scotch clips or soldering wire & heat shrink sleeves