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I tried on a few GM parts websites and it gives me both part numbers. I'll have a look at your link. ThanksWelcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
Go to GMPartsDirect.com and enter your VIN. Scroll to the suspension section, and you will find the correct part number for your truck.