Tommyyy

I burnt one of my JDM fog light bulbs out tonight and I took the bulb out and whoa ! I have no clue what is up with it, I yanked the bulb out of some gold thing. (as you can see in the picture) I cant see how it is supposed to come off or back on, any ideas ? any ideas what size bulb to buy ? anyother info would be helpfull... The loose pin in the picture was soldered inside the gold piece and the other pin is soldered onto the wire wich is in that white wraping... Thanx