cost to repair and service

[MR. LUCKY]

Would like the groups expert advise on the cost to do the following to my '97 e420 47,500 miles.

1.drive belt cost estamate from local inddy 47.00 labor, 55.00 for belt
2. lower controll arm bushings I cant feel and movement when breaking or turning inddy says need to be replaced broken? 347.oo labor 130.00 parts
3. rear differential seals 462.00 labor

are these charges in line or do I need to get another estamate? Also has anyone else had probelems with lower controll arm bushings?

Thanks in advance
MR. LUCKY