Bush Lower Arm 65 & Later Tapered Hole In Arm Mini Cooper
Lower Arm Bush Competition Pair -mini & Mini Cooper S
If you have your Mini set up to handle, these polyurethane lower arm bushes are an easy upgrade and even easier to install than the stock rubber-sleeved type. 1965 and later use these tapered style on the lower arm (the one with the bend to clear the axle shafts for suspension travel).
These will last longer, do a better job of locating the suspension arms, yet don't seem to deliver a harsher ride. One kit (4 bushings) required to do both arms.