That Hogue has released the MonoGrip to fit them.
I have been waiting since I got my Ruger Redhawk .45ACP - .45Colt as the factory grips didn't offer much in the way of getting a good grip.
the top is my Ruger Redhawk .44 with the MonoGrip, the Bottom is my Redhawk .45ACP - .45Colt