We need to fix the front ball joints. The only thing i find is the control arm is there any way I can just get the ball and can get it fix

Lower you can do fairly easy. Upper, a bit tougher.For the upper you will need a spring compressor.

the ball joint is replaced as a lower control arm. You will need to remove the tire, remove the nut that attaches the ball joint to the knuckle, seperate the ball joint from the knuckel, remove the radius arm nut, remove the bolt that secures the lower control arm from the subframe, and then remove the control arm.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

The struts on these cars do not connect directly to the control arm. The connect to the knuckle then to the control arm where it is attached by two bolts.Then the knuckle is attached to the control arm through the ball joint. The only thing I can possibly think of that can become "dislodged" is the ball joint.
#4 on this diagram is the ball joint
#5 is the control arm #3 is the knuckle and of course #8 is the strut.



Hope this helps.

Lower Control Arm Ball Joint Replacement Removal Procedure Tools Required J 43828 Ball Joint Separator

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Remove the tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
3. Remove the stabilizer shaft link. Refer to Stabilizer Shaft Link Replacement .
4. Remove the wiring harness from the lower control arm.




5. Remove the cotter pin (1) from the ball joint (3).
6. Remove the nut (4) from the ball joint (3).



Notice: Use only the recommended tools for separating the ball joint from the knuckle. Failure to use the recommended tools may cause damage to the ball joint and seal.

7. Remove the ball joint from the steering knuckle using the J 43828 .




8. Remove the lower control arm front (1) and rear (4) mounting bolts.
9. Remove the lower control arm (1) from the vehicle and place in a vice.
10. Drill out the 3 rivets (3) retaining the ball joint to the lower control arm (2).
Use a 3 mm (1/8 in) drill bit in order to make a pilot hole through the rivets.
Finish drilling the rivets with a 13 mm (½ in) drill bit.

11. Remove the ball joint (4) from the control arm (2).

Installation Procedure

1. Install the ball joint (4) into the control arm (2).
2. Install the 3 ball joint bolts (3) and the nuts (1). Follow the instructions in the ball joint kit. Tighten the ball joint bolts (3) according to the specifications in the instructions.




3. Install the lower control arm (2) to the front suspension support (1)
Notice: Refer to Fastener Notice in the Preface section.

4. Install the lower control arm front (5) and rear (4) mounting bolts.
Tighten • Tighten the front bolt to 107 N·m (79 lb ft). • Tighten the rear bolt to 110 N·m (81 lb ft).



5. Install the lower ball joint stud (3) to the steering knuckle (2).
6. Install the ball joint stud (3) through the steering knuckle (2).
7. Install the ball joint nut (4).
Tighten
Tighten the ball joint nut to 55 N·m (41 lb ft) plus 180 degree rotation minimum-65 N·m (50 lb ft) plus 180 degree rotation maximum to install the cotter pin.

8. Install the wiring harness to the lower control arm.
9. Install the cotter pin (1).
10. Install the stabilizer link to the lower control arm. Refer to Stabilizer Shaft Link Replacement .
11. Install the tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
12. Inspect the front wheel alignment. Refer to Wheel Alignment Specifications in Wheel Alignment.

SAFELY RAISE SUPPORT FRONT OF VECHICLE ON JACK STAND MAKE SURE VECHICLE PARKED ON SOLID LEVEL GROUND. REMOVE WHEEL OR TIRE. REMOVE BALL JOINT STUD PINCH BOLT AND NUT FROM THE STEERING KNUCKLE.REMOVE BALL JOINT BY PRYING IT FROM THE KNUCKLE.REMOVE BALL JOINT TO LOWER CONTROL ARM BOLT AND NUT. INSTALL NEW BALL JOINT TO LOWER CONTROL ARM.TORQUE THE BOLT TO 86 FT LBS INSTALL BALL JOINT TO THE STEERING KNUCKLE TORQUE BOLT TO 43 FT LBS YOU MORE LIKELY NEED FRONT END REALIGNMENT AFTER THE JOB DONE.

I understand that there is a tool designed to press out the outboard ball joint. I have never heard of anyone using one.
You can press out the ball joint using a hydraulic press. Actually you would need to do both ball joints because you will trash the inboard ball joint getting the control arm off to take it over to your press. Neither the dealers nor the independent shops do that either.
Your front suspension has very little adjustment, and those aluminum control arms get bent. You would cry if you went through all the effort of replacing the individual ball joints and then realized that the control arm was bent.
So far as I know, Dealers, shops, and DIYers all buy complete control arm assemblies and bolt them on. Be prepared to hit your pickle fork with a big hammer to separate those ball joints from the car.
You will almost certainly need fresh control arm bushings if you replace the arm, and you probably need them even if you are using the old arm.

To replace the lower control are you need to unbolt it from the subframe, airmatic strut, sway bar link and from the lower ball joint. The lower ball joint is separate from the lower control arm. The ball joint actually gets pressed into the steering knuckle. Then the lower control arm sits on top of the ball joint and gets bolted down. The lower control arms list price are about $330 each and the ball joints are around $78 each for oem mercedes parts. The total labor for both to be replaced is somewhere between 6-8 flag hours. The thrust arms are also part of the front suspension and those arms are one piece that have a ball joint as part of the arm. The lower control arm usually doesn't need to be replaced unless its damaged since the control arm bushings are available separately and are around $73 each side for the kit.

you can either buy bottom suspension arms with the ball koint atached or just replace the ball joints.

If the suspension arms are shot, then you should be able to feel this when driving over cats eyes in the road. when the wheels contact the cats eyes they wonder, the steering wil feel like its going both ways, not tight, kinda lose?

Ball joints dont squeek they knock! most times its just as cheap to get ball joints and suspension arms/control arms as one. some things dont translate that good from UK to Us the parts have different names here, but thats the same part I mean. When you remove ball joints and in most cases you have to when replacing the arms, they get damaged and rarely last long after being put back in place, you may aswell pay now for one lot of labour than pay twice.

Hope this helps

I highly recommend that you have a press available, they dont screw in unfortunatly.
To change uper ball joints; Remove tire Pull codder pin and remve nut Tap ball joint out of wheel/ brake assembly Remove upper control arm compleatly Use Press to push old ball joint out of controll arm.
A torch may be nessisary to heat controll arm. Press new ball joint all the way into controll arm Reinstall every thing Get a professional front end alignment. 

Good lcuk and hope this helps.

The dealer's answer (if you are interested).......

The ball joint is pressed into the upper control arm and has a tapered stud for attachment to the steering knuckle. The ball joint stud is attached and locked into the steering knuckle using a special nut. The ball joint is a sealed-for-life type and requires no maintenance. If the ball joint is defective it will require replacement of the entire upper control arm.

Sorry.