Thanks for that explanation! I have the same markings in my 65 Dart wagon!
I have included pictures of the lower control arms. They have different markings for left and right side. My concern was if this is factory markings or if someone has done it after?
I also had a school bus yellow marking in the upper area of the K-frame. What was the meaning? I also found a red marking on the filler plug for the rear end cover plate. What did that paint splot indicate?
Once again, thanks for all the information!