Just did the same on our Yukon. We were a little worried at first that it wouldn't quite match up, but as the tint cured it now matches almost perfectly.I used a 20% tint, the rears we measured and are sitting at 17-18% factory, so with the little bit of tint on factory glass i decided to try the 20% out, I am really happy i did, it could not match up any better. Thanks.