Freedom arms offers a set of (rose?) wood oversize grips that you fit to your frame , I have done a set and they came out pretty nice . the price I think was $45 .If you call to order have the S/N handy
I am going to make a set for my other 83 (both of mine are the older style ) out of black Corian, I have a few peices to make blanks from but I am not positive how well corian will hold up on a 454 . there are several grip makers that use Corian on rugers so it may just work , If I remember correctly the butter color corian is extremely close to aged Ivory in color . There are 2 versions of the 83 grip frame and the grips are different , I have talked this over with FA .