The front fenders originally came with welting, the rears did not by most accounts.
https://www.flickr.com/photos/advance-design_parts_co/15780066596/in/set-72157631868452754
There is also some felt for the inner fender to fender surface and a welt that goes around the filler plates between firewall and fender. Most of the vendors sell a kit with all the items in them.

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