just a quick question this was my car befor i crashed it...

i was woundering what are the names of these parts , and where can i gt new ones ? and is it a case of cutting the old ones out and welding the new one ???? thanks all advice welcome

i was woundering what are the names of these parts , and where can i gt new ones ? and is it a case of cutting the old ones out and welding the new one ???? thanks all advice welcome