Here's one that looks similar to mine: All Metal Black Compact Quad Train Air Horn Truck RV Peterbilt Freightliner | eBay
I don't know if that's the same seller. I bought mine a couple years ago. I removed the solonoid too and just plumbed the air hose from the original single horn on my truck to these horns. BlizzardND has heard my horns. They aren't as loud as a real train, but they sound pretty cool and they're pretty loud.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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