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Removing Window Molding- Front Doors Read, then (click photos to enlarge)
or
Photo 1Photo 2Photo 3Should be fairly easy procedure.
Note: The photos are from a 1954 truck which came with vent panes. I assume your 48 does not have vent panes.
The doors that have a vent pane, the stainless steel trim is cut slightly different to accommodate the vent pane frame.
I believe both are attached to the door the same way.