Lot of threads concerning this as I had to research it myself when I purchased my Alpha. I they are OEM racks, there will be a number on the key tumbler. Not sure about other Hummers, but the H3 has SP1 thru SP5 imprinted on them. BTW other members on this forum led me in the right direction. Mine was an SP5 that I had to purchase at my dealership. $30 apiece which included a tumbler....like I needed that. Had a tough time finding a place to make duplicates, until I went to Ace hardware. $1.99.....
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