left hand lug nuts

It is not from Mars. A lot of people including myself has been changing these left hand thread over since forever. They were more than likely changed over a long time ago. And I knew I was right on the year they changed this too. Damn it. I thought I lost my mind when someone piped in with 1970??? I alway's knew it was '73. That is when they changed over to large bolt pattern. For the most part. I guess there still was some /6 cars that were not.