A lot confusing. Gt have fog lamp which lx doesn't have. If you're telling about GT fog you can get them on internet and Ebay really easy.
Fog lamp for gt's are made by hella. Don't go to a ford dealer. These are too much expensive and this is exactly the same you'll find on internet.
If this is about the lx headlamps . Same thing.
Internet
But for these one. Get the Factory ford's head lamp. These are not more expensive on ebay than repro. And it's easier to fit what you already have. Some repro i bought in the past was a little more dark than factory ford's. Not really much, but still not the same.