The bottom of the passenger side B pillar had rusted through. The rusted section was cut out, a custom piece was cut, bent, and then welded in. Also, the passenger side cargo floor repair section that I installed years ago was a generic repair piece that fit buses from the late 1950’s through 1967. Somewhere in that date range the size of the seat mounting plate shrunk. The repair piece had included the larger size plate, so I trimmed it to match the three remaining original plates.