My car was hit on the rear left side and it shakes and squeaks it's the bar that's underneath the car that holds the tires. What's the name of the bar

The axle?

Ok cause I brought a stray bar nd it stop shaking a little so I'm trying to find out the main problem

Wait. It is a torsion bar suspension ...I had the front image up, which I will take off, click to size up

Is it the rear trailing arm that is damaged?

It looks like I need 8,9,10,1,20,5 I've brought13,19 part and 17

That's a strut assembly

Thanks y'all it's the trailing arm someone took the part off and took it to auto zone nd that's the name of the part

I have another question my brakes lights work when they wants and it's a box hanging from underneath by the gas and brake pedals on the left. Do u think it's the wiring that's hanging from the box is the problem

FordNut the two parts at the bottom of the picture whats the names of those parts