sure-grip clutches from mancini....thick or thin??

yeah, i've got a clutch-type, a cone type, and an open....right now the open is in the car, i'm puting the conetype together (i machined the cones) to sell, and have a clutch type that's going in a 489 case with 3.91 gears which will then go in the car

just gotta find the difference in the clutches that mancini sells......guess i COULD call them............