These are a direct replacement for the sealed beam unit, those with original replaceable bulb type must also change the buckets. The units come as standard with 55/60 watt halogen H4 bulbs, 80/100 watt will also fit straight in or for real night vision try the plasma blue's and save the loading on the wires as at only 80/80watt draw they give light equivalent to 135/115 watt. Or the E marked bulbs if required, draw 55/60 watt and give the light equivalent to 100/110watt.