1970 was the last year for LH thread lug nuts on the RH side of the car. For 1971 all lug nuts were RH thread. Although I have worked on these cars for over 20 years, I screwed up when trying to remove a RH wheel on a 65 Polara this past weekend. I'm busting my guts to crack the first nut loose and trying to fingure out why it's so tight. Then -- DOH!!! -- the source of the "problem" dawns on me. Pete in PA