There are a few different leaf spring setups that can come on your Chevy Silverado or GMC Sierra. Along with the series of GM pickup it is (1500, 2500, 2500HD, 3500, 3500HD), there are other factors that influence which spring is in your vehicle. With these vehicle applications from 1999-2013, you can generally count the leaf springs that are in the stack and arrive at the correct rear spring seen above. Please feel free to call us if you have any trouble identifying your spring.