I bought the MP offset spring hanger and shackle kit to put on my 1967 Dart GT. There were no instructions with the hangers. It looks like you have to make a big oblong hole in the outside of the frame rail to make room for the welded nut on the hanger, and it has to be a couple of inches long to allow room for the studs to slide in. Am I missing something here? I know this is done all the time, I just want to make sure I am doing it right. Thanks.