Erson 1.6 with smaller diameter thicker wall shafts with bushing/sleeves at each mount point that are the same diameter as a stock shaft, so rockers have more material around the needle bearings.
Oh, I got jack chit on what I wanted BUT I got everything I needed.
And with what I already have, I didn’t know I needed anything else.
Want? That’s a whole nuther topic! Ha ha ha ha