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Depends on what you want to do (what kind of light) and how deep your pockets are. For years I have run Hella XL's on my 245's, mounted on top of the bumper. These are a European-pattern extra low beam (extra as in "additional"), and for the hilly, twisty roads I drive in New England they are just fine. The beam reaches out about 200'. Sadly, Hella no longer makes them.
You can mount true fog lights, but these throw a short, broad beam which I find not terribly useful except in inclement weather and speeds are reduced anyway. Some use the fog lights as cornering lights, aimed outward instead of straight ahead. Fog beams must be mounted low to serve their intended function, since the low mount minimizes light reflection off the rain, snow or fog droplets in the air. Low mounting also means they are very vulnerable to road damage.
Driving lights are closer to high beams in that they tyrpically project a narrow beam of light quite some distance ahead. Properly aimed, they won't do a lot to illuminate things within a hundred feet or so of the car, but boy - if you drive straight roads they'll fry a cat naked at a hundred yards. You absolutely, positively MUST turn these off if you have oncoming traffic.
Pencil beams are like driving lights, but even more focused. Pencil and driving lights typically are mounted at about the same height as the headlights.
No matter what you buy, get a known brand like Cibie, Hella, Marchal or PIAA. Skip the $25 cheapies - reflectors and lenses will be of poor quality. Skip the "blue" tinted lights since these do nothing to improve visibility.
If money were not a concern, I would probably buy PIAA dual-beam auxiliary lights, since their quality is good and they offer instant flexibility between fog and driving beams. The lights are compact and mount easily. I don't care for their looks - a little too round and hi-tech for a 240 - but that's a matter of taste and not function.
The very best lighting setup I enjoyed was on my '72 Opel Manta and my '80 Saab 99. Both cars had 4 5-3/4 inch headlights, and I replaced the stock units with Cibie and Hella H4 dual filaments hi/low beams and H1 pencil beams for high beams. For my driving, there was absolutely no need for auxiliary lamps.
There was a thread here in Feb or March which talked about a quad-lamp retrofit for the lamentable plastic-lensed late-model 240 headlights. It used a headlight bucket from the Volvo truck line, for about $75 a side. This would allow the use of replacement 5-3/4" lamps as I mentioned above. I am tempted to do this, but am timidly waiting for someone else to do it first so I can see what the finished product looks like before I invest!
There is no existing wiring for fog lamps on your 240 unless the car was equipped with them from new. However, it's not hard to set up new lights, as long as you follow the basic rules of using a relay (or relays), fuses, proper-sized wire, and good grounds. Look up stuff on the web by Daniel Stern, and also Susquehanna Motor Sports - the latter has wiring diagrams which are easy to follow.
I've probably raised more questions in your mind than I've answered, but I hope this has been helpful nonetheless.
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