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Silverado/Sierra Interior differences for Katzkin?


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I'm looking into upgrading the interior on my Sierra 1500 Elevation with either Katzkin or a Leatherseats.com product. There is a company on Ebay selling the interior packages for around 300$ less than retail for the Silverado but they do not have the Sierra listed as a fitment option. 

 

I know that in the past if you could not find a Sierra part it was generally "ok" to just buy the Silverado counterpart and use that in lieu of a product that was specifically listed as being a fit for the Sierra, but we are talking talking 600$ in this case and I was just wanting to verify that seats would match. 

 

Would any of the part number guru's out there be able to tell me if the interior seats for the Sierra and Silverado are matching? Or what the differences may be? Katzkin doesn't even show them as having the item available for purchase, but after calling them they do say that they have options. 

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