These are sold per bush but fitted in pairs. Apart from very early cars all minis up to 1996 had 2 of these each end. from 1996 rover fitted a single silent block type bush which will fit your existing 21A1109 arm(part number usually stamped on arm) later 1275cc cars had a longer bar 21A1817 fitted where the engine was moved forward. there is also a poly version available as CRC5329POLY