If your Striker wanders and is thrown off line by every bump then give it a go, I have the details or search the google group.
Whilst my front suspension was in pieces I replaced the ball joint covers, they were from Minispares Part No. 21A425 X 4 for just over a fiver!
Just had the tracking done, what a laugh the young guy started the engine so that the power steering would work!.

Cheers for now