Your dealer is half right: you may not be able to order all of the needed parts through Hyundai USA - but you can get hem on eBay. Essentially, you need 3 parts to do an OEM install:
- The left/right fog light modules
- The stalk left side (blinker) copntrol stalk with the fog light switch (ie., the part from the NA 5.0 modle)
- The wiring harness for the from bumper
You can get all three of these parts on eBay. I got them form this guy with no hitches - delivered quickly:
lights and bumper harness:
http://www.ebay.com/itm/like/171763463281?ul_noapp=true&chn=ps&lpid=82
stalk:
http://www.ebay.com/itm/Genuine-OEM-Fog-Lamp-Light-MF-Switch-For-2015-2016-Hyundai-Genesis-3-8-5-0-/171715662714?hash=item27fb0d137a
If you use the new bumper harness, it is plug an play, but the pins for the parking sensors need to be reordered to match the one in place (easy to do).
The details on what you need to do are in this thread:
http://genesisowners.com/hyundai-genesis-forum/showthread.php?t=16596
Conversely - you could dissect the replacement harness and make a new subharness just to feed power to the fog lights and not touch the parking sensors at all (or even not have to remove the front bumper cover).
In these setups, you'll have full OEM functionality: the fog-light indicator will light on the dash board and the fog lights will turn off when your turn on your high beams (as required by law in some states). The lights switch will also "remember" it is on and the foglights will automatically come on with the headlights once you turn them on the first time (so you don't have to turn them on every time you enter the car), but you can manually turn them off with the switch (and the'y stay off and won't come on next time the headlights are turned on) if so desired.
The other option is to just get the fog lights and wire them to the fusebox directly - either with a switch (you'll need to run though the firewall and drill some holes to mount) or wire them to the headlights wiring in some fashion so they come on with the headlights (but won't turn off with high beams).
I prefer the OEM approach - you can easily do it all yourself. The only thing I did was to have the dealer install the replacement control stalk as you need to take the
wheel off and I did not want to screw with the airbag (service manual also indicates special tools are needed).
Good Luck.