The headliner bow #1 is as stated interior cab color. The door weatherstripping surround #2 is also cab color. #3 is a bit unique, this is actually stainless steel not chrome and you can polish it to look like new. This trim was part of the deluxe cab option, trucks without it are painted cab color like the previous parts. Here is a picture of the polished stainless on my truck.
http://www.flickr.com/photos/advance-design_parts_co/8129179541/in/set-72157631867396207
The full set includes inner/outer trim on the doors and windshield surround on the outside only, all trucks have the outside polished center piece. The inside pieces are cab color on all trucks.
Just a note the 60+ year old stainless was completely oxidized when I found it on a parts truck. A few minutes each on my buffing wheel and it looked new and has stayed new looking, it is very high quality material.
Donor truck:
http://www.flickr.com/photos/advance-design_parts_co/sets/72157631870734114/

1950 Chevrolet 3/4-Ton 3600
More pictures on Flickr