Two different part#s
I got a response from GM parts on this. They are basically identical in every way. The only difference is that 23120485 is being sold by Chevy Performance Parts division, which is a separate division from GM Parts and often sells Performance Parts at reduced prices. But they are exactly the same and both come with the mounting bolts. So save yourself $30 and go with the 23120485 - PARTS PKG: http://www.gmpartsdirect.com/results...umber=23120485
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Last edited by sixt3denied; 05-06-2014 at 12:46 PM.