Horrible noices front passenger side car and knocking on right

Horrible notices front passenger side of car and a knocking sounds from driver side, steering wheel vibration.
Had passenger side idler arm replaced, car went well for couple hours.
When driving at low speed horrible nocking grinding like notice.
Do you think part on drivers side could need replaciing?
Is the driver side set up different from passenger side?
There appears to be a part shaped like a box on driver side when you twist wheel can hear a knocking, what is this called?
If passenger side fixed idler arm can driver side be still causing this and sounds on both sides?
Looking forward to hearing from you
Regards aaron