mirror placement

[duke10]

I have recently acquired a 1972 gmc short bed 4x4 with an automatic transmission. The truck was purchased from the original owner. I looked for this truck for over ten years, as I owned the same make, model in high school. The truck is hugger orange and has not been abused, lifted, cut or bondoed. I feel very fortunate to have found this gem and am trying to keep it as original as possible. Now to my question. I purchased a drivers side mirror from chevyduty.com, the small rectangle type. The mirror is great but did not come with mounting directions. I would like to know where to mount the mirror on the door. Measurements or pictures would be greatly appreciated. I am sorry that I do not have pictures of my truck available yet but I am working on it. One other point. This is a great web site and I appreciate all of the help that is available. Thank you in advance for your replies.