A plate pin assembly for use with a fixture that holds multiple plate pin assemblies for use in chassis-body marriage during the manufacturing of automobiles. The plate pin assembly has a lower end that fits into a bushing hole on the fixture to attach the plate pin assembly to the fixture, an upper end that supports or otherwise interacts with the vehicle chassis or body, and a quick-disconnect mechanism to enable fast changeover of the plate pin assemblies on the fixture when switching from one vehicle application to another.