PFF75K-504 Front Upper Control Arm Inc Bush Kit is a pressed steel replacement wishbone pre-fitted with zinc-plated outer shells and Black 95A bushes for ultimate chassis control, performance and durability. For an on-car camber adjustable version use PFF75K-504G. These will only replace the factory steel arms and will not replace aluminium arms. For most people, the Tesla Model S was the first mass-produced electric vehicle to be seen on roads across the globe. Since then, the US carmaker has grown to become the global leader in the vehicle electrification arms race. The Model S/X, however, run on suspension layouts that we would recognize from well-known and much-loved European brands but weigh in at 30% heavier than a similarly sized 5-Series saloon. With headline acceleration figures, portly kerb weight and bushes made from natural rubber, it is no wonder the wear rate of bushes and ball joints can catch owners by surprise, giving way to knocks, clunks and accelerated tyre wear. We have applied what has been learned from years of manufacturing to provide a reliable and durable bolt-on replacement solution, with polyurethane bushes pre-installed in quality-supplied wishbones.