Well I am finally getting ready to start putting the front frame rail back on my 69 stang and I noticed that some of the places where there were brackets welded to the frame rail there were also nuts weleded to the inside of the frame, but there were no botlts, just the holes. The brackets were welded and just had emoty holes where the bolts should have gone.....so my question is. Were the brackets bolted or welded from the factory??? OR both???