I've read a few threads on here about the different types of stock rocker arms that are available ... seems you can get a "centered" one as well as specifically for the L and R side of the piston (not the L and R side of the engine). Anyway... I was going through my valvetrain and cleaning it up when I noticed some galling on a couple of my rockers and so I decided to replace them.... since one was on the left side of it's piston and the other was on the right side of another piston, I decided to pick up some L and R stamped rocker arms. Since there are a few threads about this but no pictures, I figured I'd post the differences for those of us to see who haven't seen them. From the top they don't look that much different, other than the obvious stamping of L and R. The one in the middle is my factory rocker that appears to be more centered than the others. From the bottom though, you can definitely tell that the pushrod seat is off to one side as well the oiling hole seems to be in a different place. I'll have to wait to see if they perform any different but I will be sure to have the valve cover off when I am priming to make sure they are oiling properly.