You are correct and the 69 model year was the first year for the trim rings. I used a set of Scale Equipment Limited Magnum 500's on my 75 Roadrunner I built a few years ago and they were very realistic but I just checked on their sight and they don't seem to offer them anymore. Sad because like the 1:1 wheels they were a two piece item, I think. I am at work now but I will have to go home and take a shot of my Roadrunner's wheels as they were most realistic Magnum's I have seen.