I do not recommend them for a 2500 GMC Sierra 2500. There is not enough space on the driver's side for the back of the lamp. I think if you can find one of the flexible radiator bulbs you'd be better off. I found this out by turning off the headlight, not realizing I'd hit the windshield washer fluid reservoir and broken the bracket. A little tech junk and JB welding and I'm back in business. Here's what I don't recommend you do, don't do it like me. Do not reach for the hacksaw and saw off one of the sides of the radiator. I hope you have more patience than me and get it right. I'm sure some engineer somewhere is messing with my mod, and that's understandable. But for now it works. The brightness is a little disappointing, the HID bulbs they replaced gave brighter light. If it wasn't for contamination, I wouldn't have switched to these LED bulbs. Pros and cons of switching from HID to LED - it's up to you to decide which one works best for you.
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