2001 GMC Truck. This set is identical to the original. All you have to do is use your old mounts. The wiring harness is connected to the horn housing. This is a great set of horns. GMC charges $70 for the horn if you can find it. This price is better than the cheapest universal horns. Just too good to be true. Replace your GMC horns with this set. Will likely replace all GMC horns, you just need to reuse the old horn brackets. Klaxon sound Excellent, very loud, no need to upgrade. Happy signal. π
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