Even Jim Carter is confused about widths. His little info sheet says the wheel pin stripes are 3/16 inch, but his tech tips on his website says 1/4 inch.
Being handpainted, as I have said before, there was a lot of variation. Once I closely inspected an original one that varied from 1/8 inch to 1/4 inch!
What I would like to know is what width was the original intent of Chevrolet. I doubt we will ever know.