Don't count on Rock Auto for their "application data" being correct. After this many years, their lines get muddy. I found leaf spring shackle bushings from NAPA that said they would fit. I special ordered them only to find they were too long. 55 second series started using wider springs. So I went the Rock Auto route. The drop down showed absolutely they fit front springs for my 54 half ton. They too had to special order them from the exact same warehouse as NAPA which turned out to be GM via AC Delco. They were too long also. Bottom line is that even GM doesn't know anymore what their parts fit and what they don't. The years have given us younger parts guys that either have their elbows super glued to the counter when you tell them what year vehicle you have or they can only show you what the computer says is correct.
