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The OEM kit, if it's like my S70 and my friend's S60, comes with a complete mounting assembly. Most 850's have a round fixture, but they don't produce a particularly good foglight pattern. (The ideal pattern is very even lighting around the car, 180 degree sweep, for a distance of 50-75 feet. There's a hard horizontal cutoff to keep backglare from rain, fog, and snow from polluting your forward vision. Low mounting points have the advantage of adding contrast to uneven road surfaces, making potholes and the like easier to see at night.)
Your car is prewired. The foglight harness (one in each fender) includes a green-orange wire and a black wire, inside a corrugated black plastic harness with a two-pin connector at the end. The connector should be deadheaded onto a dummy receptacle.
If you buy the OEM kit, you should also get a relay and a dashboard swich as part of the kit. You may also have to add a fuse and connect a jumper (as Erlend Hagen learned). In the US, the foglights are wired so they will work only when the headlights are turned on. Should you want to use the OEM switch but make the foglights independently switchable, there's a useful set of instructions available, created by fellow Brickboarder n0v8or.
For a better foglight, you'd do better with Hella MicroDE's - a small, 2-inch diameter projector style fixture that produces an exceptionally good pattern of illumination. You'll have be a little creative to mount them.
Never remove the towing toop. And never run anything higher than the rated wattage in any fixture - a halogen light is a heat source that produces light as a byproduct; higher wattage increases heat significantly and the result inevitably comes to grief.
The current generation of Ecode lenses (European specification, identified by an embossed E2 in a circle on the lens) are probably the most effective lighting improvement you can make, especially in combination with the new generation of higher output halogens (like Sylvania SilverStar, Philips Premium, Philips Blue Vision, Hella LightPower, etc). These halogen capsules are more efficient, producing more light without a significant increase in heat; 30% more light for 9004/9006 lamps and 50% more for H7 lamps found on the 98 and newer Volvos.
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David \\ (98 S70 T5SE Black, misc mods (mostly lighting), red calipers) (92 940GLE)
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