Take note - Chevrolet changed the wiper arm attachments from the standard hook attachments to a newer-style push button attachment on Gen 7's. Do not just measure the lengths of the wipers and go out and buy them - not all wiper blades adapt to these newer-style arms. The "Trico NeoForm Beam Blade" is one example that comes in 24" & 21" and fit the push button arms. You can find them online - just make sure you punch in the right make/model/year to make sure you get the right lengths and mount (push button mount for 2008+, and hook mount for 1973-2007).