Pictures start here for the clips, I believe I bought them from Jim Carter. Buy a couple extra because occasionally they break. Someone will chime in on the sizes (I will check the Salesman Data Book tonight) to confirm. I don't think they should be different widths, I also do not think whitewalls were an option in 1951 on Chevrolet or GMC.
https://www.flickr.com/photos/advance-design_parts_co/48992108807/in/album-72157631868452754/