Yep, that is what I am looking for. I believe they were called J rims due to the lip on the rim that keeps the tire on if you get a flat, (or maybe if you drive like a jerk?).
I'd like to get wider rims for the back.
I am going to look at a set this week, is there any way to tell if they are regualr rims or Formula S rims? The width maybe?