Or just look at the wires in your new fog lights and u will see that there is 2 lights, so 1 wire is a earth and the other 2 wires are for the 2 positive feeds, one to each bulb. Your car will only have 2 wires, a positive and a negative, if u want to run both the both bulbs just join the 2 positives together (this could cause u wof issues if u have the facelift headlight as u will have 8 lights going on high beam) In the standard rsb/gtb the outer bulb of the 2 is a turning light and comes on with the indicator, obviously ur pre facelift gt won\'t have this feature.
Hope this helps