From 1941 through 1953 the GM pickup bed sides are the same, however, a major design change began in 1954. This new bed side design with very few modifications continued to the end of the true step beds in 1987. The unique feature of only the 1954 through 1955 mid series bed sides is the flowing grooves that fit the edges of the rear fenders. These actually give a better seal with the older design fenders when they attach to these new 1954 sides. It prevented mud and dust from passing up from the wheel well area. For the perfectionist: These sides have just recently been reproduced. (The old attaching to the new!)
