I didn't need it in the end. The pilot's 07 Colorado 3.5LI was leaking some oil out of the breather (on top of the valve cover) every day and I figured I needed a new valve cover gasket. But when I removed the breather assembly I found that oil was leaking out of the crankcase breather tube and it collapsed. So I bought a new one locally and haven't lost any oil since. I took this valve cover gasket out of the box and it looks like a good piece of equipment. I put it on the shelf until I need it (nearly 300,000 on a truck). Fast delivery, good seal = five stars. If I use this and find problems in the future I will update.