I can only say they are pretty narrow front to back, and the right panel is relieved for the magazine catch but the left panel is not, so its button must be farther forward.
The relief cut on the top left panel looks like the clearance cuts on 1911 grips for the plunger tube -- the tunnel for the spring that acts on the slide stop and the thumb safety.
Not completely sure what they will fit, though, like others, my first thought was 1911.
I have to say I like the look of the palm-swell. That would probably make a 1911 feel really good in the hand. Though the lack of checkering might make them a little less than ideal for shooting.
The relief cut on the top left panel looks like the clearance cuts on 1911 grips for the plunger tube -- the tunnel for the spring that acts on the slide stop and the thumb safety.