[Jeff H]

Good point. My 01 Silverado had aftermarket wheels that came with the rings to help center the wheels. That link provided above shows the Silverado 1500 4wf 6 lug wheels have a 78mm center hub. If you're going with stock GM wheels then you should be in good shape with the hub center but it looks like the newer wheels do have a different offset. I'm not sure what the L vs M/H means with the offset but that's the difference it shows. I searched around for a while to find the specific backspacing and correct center hub when I was looking.