FYI- on ohter BMWs Ive done done both 'just the bush' and 'the whole arm'....I will push the old bush out, and a new one in...then the next time, replace the whole thing. The rationale is the arm then only sees the stress of a bush replacement 1x. Plus balljoints are good for at least 2x the rubber bush.

OP- there are a zillion places online to buy a suitable tool, amazon, etc. By the time you pay retail shipping 2x, just order one on amazon.