Rubber bushing for the eye at the inner end of the control arm; two (2) required per arm, four (4) required per car. Sold each.
Most classic Minis no longer use this bushing, and can be upgraded to the steel-sleeved 21A1882 Mk2-on bushing; this can be force-fitted to Mk1 arms. Or as an alternative, use four (4) SSS0188 polyurethane Mk1 bushings, which are a direct fit, but stiffer than the rubber original bushings.