The glass that I have for a 68 roadrunner is not square, it has a drop down on the back side bottom. I have several pieces of this glass and they are all the same. pictures in the service manual and on e-bay do not show this drop. The glass is out of the car and I can hot remember if I took it out of my car. can anyone tell me if some door glass for the roadrunner did in fact have drop on the back bottom of the glass. thanks