Well, seems in that plane it can only be:
1) The ball joint
2) The strut
3) The bearing
4) CA bushings (least likely)
Do not presume the balljoints are good just because the boots are intact. The boot material is unusually good on these. Heck, one of mine had an intact boot, and it was so corroded, it popped out of its socket...
Balljoints would be less likely to exhibit play when they are 'loaded' (springs are fully extended), however.
1986 300E 5-Speed 240k mi.