Now why not go and buy something from them as a sign of saying "thank you".
Having heard of this grip split before, it's most often caused by the grip screw being over tightened. Just sayin'.
As it's a Bisley, none came with any grip material other than wood. Some Bisley Vaqueros models did have the fake ivory ones though.
Also, check and find a Ruger "warrantee" there isn't one.