Thanks Bill and 23! They are 4" Pilots. I mounted them from the front of the bumper by the way. They throw a surprisingly good amount of light and do a good job of lighting up the sides of each lane. The lane lines can be non-existent up here. For the price, I'm pretty satisfied, but they do get a little overpowered by my Silverstars.
They use H3 bulbs, so I'm going to swap out the bulbs with Silverstars sometime soon. I'll probably make a better wiring harness (better wires, cleaner routing) at the same time.