You may need to look at the door shell part diagram. It may be there.[/QUO
The part I have for my 65 convertible is identical to the picture and there is a bracket on the inside of the door near the top front edge where the vent window frame bolts on and this piece is required to attach it to the bracket. there are big square holes in the door edge and this piece allows the bolts to attach and enable some adjusting. I also have the ones with the slanted holes and I think they will be on the other bracket holding the back of the vent windows with the door window channel which also has to adjust to fit. I have not installed these yet but I can see where they will go.