Yes they do, however you only need to strip away the undercoating and inch or two wider than the subframe connector width prior to welding them in. You can then re-under coat the area to match using Resto Rick's undercoating mixture and a Shultz gun with very good results. I did that on my 1970, although I had to remove quite a bit more of the original undercoating, because it had gotten a little oil soaked and damaged throughout the years.