[Kiwi]

Make life easy on yourself by calling up Classic Industries and ordering:

1179X = 7-inch, convex outer (like stock), Xenon headlight
MX01132 = upgrade wiring kit for headlights (complete with modern relays)

I recent installed this Xenom headlight system in my 1971 Cheyenne. It was fairly priced, a cinch to do the install, and the light is radically more white and bright than the previous halogen bulbs that were there. Plus, the new Xenon bulbs look 90% the same as the stock type bulbs.

If your truck has four front headlights, Classic Industries sells specific bulbs (one low beam, one high beam) and 4-headlight wiring harness for that too.