An assembly includes a first vehicle seat component, a second vehicle seat component that can pivot relative to the first vehicle seat component, a fastener to secure the first vehicle seat component and second first vehicle seat component together, and a spacer to absorb radial vibrations. The spacer includes a body and at least one flexible leaflet located between the body and the fastener to absorb axial vibrations. The body and the at least one leaflet are integral and monolithic to define a single component.