MB control arms have very durable bushings (with a few exceptions). They do get destroyed by oil leaks though. I would not replace them unless oil soaked or otherwise obviously damaged.
The upper ball joint comes with the upper control arm which comes with its bushing. The stabilizer attaches with a rubber bushing that is cheap and probably a good idea to replace. The lower control arm has two ball joints and only one bushing. The bushing usually is good. The ball joints don't require removing the spring which the bushing would. I would leave it unless the springs are being changed or removed.
In the rear there is little to wear out. The control arm bushings never wear out. The subframe mounts do wear and would be a good idea if collapsed.
Bosch Master, ASE Master, L1
33 years MB technician