lower control arm bushings on 2000 BMW 323i

this car was in an accident it was repair sometime later left wheel fell just disconneted from the metal body of the car (while driving at a parking lot) mecahnic said need to have new controll arm bushings , while installing new bushings mechanic point out to me where the end of the control arm sits in the frame of the car underneat, there suppose to be two little metal guides attach to the metal frame of the car because of the accident those guides are broken and cant' be welded to the frame new ones this little guides hold the end of the control
in position so two big screws can hold the controll arm. my question is are these guides extremattely imp or the two screws can do the job and hold controll arm in place safely i am really worry pls advize if we can continue to drive this car it is safe? thanks

Asked by for the 2000 BMW 323i