I have wind coming in my passenger side front windows on 2003 S10 pickup. I used a hose to see where the leak was coming from and I found it was coming in where the front of the door meets the body, just above the side view mirror. All the weather strip on the outside looks fine... but I noticed a small piece on the inside was missing... I checked the driver's door and the weather strip is on that side. It is about 2 feet long and runs on the inside of the door sill. Anyone know what that piece is called and where I can get one?

 

Weatherstrip and you can find it at rockauto.com