I am not a consistent reviewer honestly, but I was inclined to review this item for two reasons. First off I am a car guy, and somewhat detail oriented so hopefully this review will save somebody some time and disappointment. I selected these bulbs due to the description and reviews saying they are perfect for DRL in the GM trucks. It is my opinion they are not, the LED are pointed towards the base of the bulb and rely solely on the reflector behind the bulb. The GM trucks truly aren't designed for this type of a bulb, they rely on the bulb to visible facing forward. To confirm this concern I pulled into my carport which has a white cement block wall. In the past when I pulled in the DRL would be visible shining against the wall until the auto headlights engaged, with these bulbs I pulled in and they were not visible at all! I backed out and inspected the lamps to find one was lit, the other was not, the one was not visible because it relies on the reflector the light is barely visible forward of the vehicle. When I installed them I could not test them because it was dark and my older Silverado does not offer a means to bypass the auto headlights. After reviewing them I realized one did not work out of the package. Just to make sure I swapped them left to right as well as used my old bulbs to test the socket as well. My conclusion: in the GM trucks and suvs prior to 2007 these are not designed to be a safe alternative to the factory style bulbs.