If your lucky this can be as easy as a plug and play job. The harnesses are the same for both cars
Step #1 - Look under car at point where fogs would be and try to locate the socket and factory wiring. If there continue on.
Step #2 - Remove headlight switch/plastic cover in your car and try to locate the relay or relay/indicator plug. Read the later parts of the post further down in this section " Adding lights to a GL"). (Sorry, I dont know how to link to topics) You are looking for the parts pictured.
Step #3 - Go to a Pick a Part and find a Mystique with fogs . Get the Light switch,harness and fogs. I paid $8 total for my parts (harness - free, 2 foglamps + brackets @$3 each and 1 switch - $2).
Step 4 - Disconnect negative cable on battery. Attach foglights/brackets, install fog/headlight switch and harness. My car already had the fuse installed in the fusebox, but check for that also.
Step # 5 - Turn on fogs