There was no factory chrome/stainless around the belt line. Originally the trucks came with a painted stripe in that area as shown here.
https://www.flickr.com/photos/advance-design_parts_co/12315095395/in/set-72157640522200463
There was stainless window trim available on deluxe cabs (side windows and front glass only). This trim and additional chrome beads for corner/rear windows are now available as reproduction items (chrome bead is not original). The original trim is also available on occasion here in the Swap Meet or eBay. Original install is shown here.
https://www.flickr.com/photos/advance-design_parts_co/12315238913/in/set-72157640522200463