It was all included in my trailer package. I actually stumbled upon the couplers and rubber cover in the back. Open your tailgate and look in the left storage bin under the rear window. That's where I found mine with an instruction sheet. If you have the monsoon system, you wont have a storage area there, there will be a speaker so look in the right side storage bin. It might be there!
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2008 Hummer H3 Alpha Adventure. Graphite Gray Metallic.
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