CLk 209 replace 1 upper control arm or both sides?

[Catfish22]

Hi, I had side to side play on the front right wheel, I changed the steering arm ball joint and the upper control arm, which cured the problem. Would it be a good idea to change the same parts on the opposite side aswell, even though there is no play? There was a big difference in stiffness between the old and new ball joints.... thanks

 

[Trickythemerc]

A very good idea to change both sides. With any suspension/steering component changing both sides is the better plan.