Door Mirrors help

[akpackfan]

'71 C10. The PO put some cheap plastic mirrors on the doors so I bought some OE style rectangular mirrors to put on. The doors don't have any holes in them where the stock mirrors would have went (which is odd to me...) so I'm not sure how the OE mirrors go on. I assume the metal "plate" goes inside the door and the gasket goes on the outside of the door with the mirror therefore I'll have to remove the inside door panel?

Also, could someone attach a pic. of the stock style mirrors mounted on a door so I can get an idea of where they should be mounted. Thanks......