Grip shape and size

I have wilson (PS97), head (RadOS), and prince (TTL, TW107) racquets at hand. They do have different grip shape: head is more rectangle, prince closer to square, and wilson in between. Pros must have customized the shape, there is no way using standard Head with western grip since it is so rectangle. See picture below, taken from TW forum.

Added: dunlop grip is very slightly smaller than wilson (CX 200)