i am replacing upper radiator support bar, do i drill out the spot welds

there is nothing wrong with frame, a heavy piece of barstock dropped on support and bent it, also damaged radiator and ac condenser. i ordered new parts and know that spot welds where not bolted will have to be drilled out, i was just hoping that someone could recommend a starting drill size and type of bolts and nuts to reassemble where spot welds were as it cant be spot welded again. i own a machine shop and was changing oil and one of my employees bumped other side of wall and knocked a 3 inch 8ft long piece of barstock over. hood was up. if you can give me this info i would surely be thankful. perry