You wont find an oem style aftermarket replacement if that's what you are looking. Pacesetter makes a header for these trucks, and you can find an Australian no name brand on ebay also.
pacesetter has not made a paired port header in years - I talked to them at SEMA a few years back - they have the jigs but wanted a 25 header minimum to make them again. The aussie header needs mods to fit the US trucks, unless they corrected the header by now.
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