About all you can say about 273 rockers, is that you have a set of adjustable rockers. The ratio's are not anywhere a true 1.5. This is due to them being a OEM piece & all it had to do was function.
I really like the Crane ductile rockers. I ran them for the past three seasons, no problems at all. I did change them out over the winter with a set of the Hughes aluminum rockers, that I had gotten in a trade. These are some nice pieces.