Those are pretty thin actually! Before I got these I got these "cool hand" grips on Amazon, and while they looked awesome and seemed well made they were too thick esp in the thumb area so upon recoil it actually hurt my thumb to shoot! those are back at amazon now. and I got these LOK grips, I haven't shot the gun yet but they are much thinner esp in the upper thumb grip area.
ps for Beretta 92S owners they make a grips with heel mag release cut out too.