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A quick google search might help. If you know your vin you can look it up to see what options you have. There is a thread with the vin lookup. I'm sure others know the answers right off hand and could help. Maybe someone will chime in here. I think the vin website is compnine.com
Look for the rpo codes in glovebox and try something like this- http://www.gm-trucks.com/rpo-code-lookup/
Visually, Z71s come with different wheels, usually 17". Also, they have a Z71 emblem and the roof racks are taller and beefier. The bumpers are color matched where as on an LS or LT they would be chrome.
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