The after market fog lights are fully enclosed. Just need a good 12V source not to mention a switch location. These should come with a relays

Driving lights work kind of in conjunction with the brights, for just more light. Mount two street legal 55 watt lights on your bully bar, or at least on top of the bumper. Turn off with oncoming traffic.

True fog lights are a pair of 55 watt white lights that casts a flat beam, must shine low under the fog and close to the road with some light shining on the road to see the lines but not cause a reflection back up to the fog. The perfect place would be in front of the bumper (bad idea) or below the bumper. When aimed correctly fogs can stay on with oncoming traffic. The key is a proper beam spread.

Edit add: I think most of aftermarket fogs are meant to be mounted upright, on top of, but check.

Tom

Volvo has a nice little instruction manual that comes with the 240 acessory fog lamp kit, gives differences for year, location of holes in bumper to mimic the factory installation and the switch and relay wiring. I have a manual somewhere but am too busy to dig up and scan.
I'm sure you can find it on the internet somewhere.

The biggest job is drilling the hole into the bumper, IIRC it is bigger than 3/8 and needs a 1/2 drill and jack up the car to gain clearance and go through 1/4" alumnimum. You also need to drill a hole for each lamp wire in the air dam

Buy front fog lights,brand of choice. Drill hole in front bumper to hold said lights.Run wires back to a relay and interior fog light switch. Then enjoy someone backing up into said lights and breaking one of them. Nothing to it.