I dug up a complete list of the parts needed to light up a 318i/is. Its a break down of the kit "Installing Set Fog Lamps" BMW part number 63 17 9 060 617 (that part number is NLA). Here's the list:
Part Number------Qty-----Description-----------------Supplement
01 29 9 770 749-----1-----Installation Instructions-----NEBELSCHEI.E30
07 11 9 901 294-----8-----Hex Head Screw-------------ST4, 8X16-C-Z2
61 13 1 370 987-----2-----Fuse---------------------------7,5A
61 31 1 380 013-----1-----Relay
61 31 1 380 352-----1-----Switch Fog Tail Light
62 11 1 368 299-----1-----Bulb---------------------------1,2W
63 17 1 385 945-----1-----Fog Lamp Left
63 17 1 385 946-----1-----Fog Lamp Right
63 17 1 386 461-----8-----Expanding Nut----------------ST 4.8