You're going to have to have one custom made by someone. To my knowledge, I have never been able to find after market grips for Bear bows. I had a Carnage and was looking for the same thing. Could never find one. I got used to it, and shot the bow very well. The grips on the new Bears are much slimmer. Cant wait to get my Motive 6!
Reminds me of the old Henry Ford saying about his automobiles a century ago or so. You can get any color, as long as it is black.
Nothing is form fitting in archery. If it fits that's good; if it doesn't look for another bow.
Of course, I learned with basketball. I adapted. It was the same size basketball, regardless of the size of your hand.
I'm not a big fan of the new ultra slim grips on bows these days. I've been wrapping the grips with the tape used for tennis racket grips. Its a little grippy, softens the hard edges and insulates quite well. Its a cheap try and maybe you'ill like it.