I found some grips that fit the Superduke perfectly. Very firm & thin. The grippiness is good, but comes more from the tread than the compound (they aren't "gummy" or "tacky" but still allow a secure grip). I'd imagine these grips should last a very long time.
They came with a goofy, patented, plastic ring that would allow mounting on bikes with longer grip lengths, but that got tossed in the trash. You can see from the photos that the grip length is perfect for the Superduke, allowing the grip to sit inside the little lip on the end of the throttle tube and providing a thin gap between the end of the grip and the bar weight (so the grip won't drag on the weight and cause any stickiness when trying to open or close the throttle).
Galindo "F1" 120mm
They came with a goofy, patented, plastic ring that would allow mounting on bikes with longer grip lengths, but that got tossed in the trash. You can see from the photos that the grip length is perfect for the Superduke, allowing the grip to sit inside the little lip on the end of the throttle tube and providing a thin gap between the end of the grip and the bar weight (so the grip won't drag on the weight and cause any stickiness when trying to open or close the throttle).
Galindo "F1" 120mm