Check local laws and states near you if drive in them often. Don't trust local and online stores to say anything. Don't trust most people that have them either.
Many states have rules on how there installed, when used and must have Low Beam HL on at same time.
wiring See my Cave,
Fog/Driving lightseven then...
Fog On must not "hind" the turn/park bulb when they are on. Fog/Drivings lamps are many times Brighter then turn/park and if you hit someone because others can't see turn is blinking you can have legal problems.
Is why some put fog/drivers lamps in air inlet to radiator. Give you space and a "wall" between different lamp sets so more likely others will see turn blinking.
If the state or cops are very picky... Finding aftermarket fog/drivers that passed DOT rules is harder and often cost more then most units sold everywhere.
quick example:
www.truck-lite.com has some that passes DOT and EU rules like 80522 but that's made for large or bigger trucks/vans. Can zoom pictures there and see most labels on lenses like SAE FOG upper left corner and maker's logo/name to give you an idea what to look for.
So Can find them but not at most retail outlets including many auto part stores.
------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave