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Never mind, found some at Autozone. In case anyone else is needing some, Dorman 530-610 is the right diameter, thread pitch and knurl. They're roughly 1/2" longer than stock and the threaded portion goes out further, about 1/4", effectively making them about 3/4" longer. Worked out perfect for a 1/2" spacer.
I'd suggest starting a new thread. If I knew I'd tell you, and often I'd share some forum search results, but I'm traveling today, sorry. In case it helps, should be the same for the same year 1/2 ton Sierra and Silverado.Need help with 1/2 longer wheel studs for 07 tahoe