Mini Cooper Gen 1 Roll Center Adjustment Kit . This is an incredibly simple way to change the roll center of your Gen 1 MINI to increase resistance to body roll and correct suspension geometry on lowered vehicles. Lowering the car will change the angle of the front control arm causing suspension compression at rest. This roll center adjuster kit will restore the original roll center and includes a 5mm spacer for fine-tuning different lowering amounts and 17″ and larger wheel sizes. Each kit includes longer high grade bolts to accommodate the additional thickness of the ball joint assembly – the ball joint is NOT included.