Competition rear subframe bush 2x harder 21a2560 bushes

The Mini’s rear subframe is rubber mounted. Polyurethane (stiffer, much longer lasting) bushes are now available for the rear subframe trunions. Cars manufactured before 1976 used the same bush 2A5818(C-STR638) at the front and rear of the subframe, 8 per car.The colour of these bushes are purple. Starting in 1976 (MKIV) the front trunion bush was enlarged, that bush (21A2560) is now available in a harder format(C-STR639). These later cars use 4 of each 2A5818(C-STR638) and 2 of 21A2560(C-STR639).