Back then the original bumpers had fog/driving light mounting holes on the under side some 3-4 inches inside each overrider. That was the usual mounting point. Lights there looked good, but functionality was compromised. Driving lights work best mounted high to minimize shadows where there are dips in the road. Pro rally cars have their driving lights above the bumper or on the roof. But... the pros use ther driving lights to supplement 1 or 2 pairs of Euro style hi/low beam headlights like those on p. 61 of the Black Dragon catalog. The high beams are broad enough to light the shoulders and sweeping bends is enough out to about 1/2 mile, and the low beams are also much brighter, more uniform, and better controlled than sealed beams. Driving lights extend the visibility range to 1 mile plus, but only straight ahead and for 3-4 degrees on either side (the greater the range, the narrower the beam). Fog lights need to be as far as possible from the drivers eyeball level to minimize the amount of light reflected back into the driver's eyes. Under the bumper is better than headlight level, down at the chin spoiler is better still. In really thick fog they also have to be used instead of the headlights (which are too near eye level in a Z). That's illegal in the US, but in a pea soup fog it's the only way that works -- the laws of physics trump the laws of Congress. If you don't already have them either Cibie or Hella replacement headlights will give the most useable improvement over sealed beams. Both companies also make good driving and fog lights. I can't say if either is better today. (Cibie was a bit better in the 70's, and my 72 Z is still running 75 vintage Cibie Z-beams.) Either way use clear (white) bulbs. Your eyes see yellow and green best, and "bonehead blue" bulbs absorb some of the yellow. A heavy duty wiring harness is a good idea with the standard 55/60w bulb -- headlight fuses blow occasionally without it and the voltage drop through stock wiring steals more light than you might think. Heavy duty wiring is essential if the original wiring has deteriorated or if you want to upgrade to 80/100w (illegal on the street) H4 bulbs.