Heres a pic of the different bulbs. On the left is the #67 bulb which is what the truck should have from the factory. The 67 bulb is an 8 watt bulb, not to bright. On the right is the #1156 bulb which is a 27 watt bulb, way brighter. The 1157 bulb is basically the same as the 1156 except it has a second contact on the base because it a dual filament bulb. One filament is 8 watts and the other is 27 watts.