I also have a Santa Barbara bolt action rifle. Mine was originaly a kit gun in which I had to finnish the stock and blued the action/barrel. It is in .270 cal.
A couple of years ago, I had a synthetic stock installed. I also had it pillar bedded and the barrel free floated. The Gun Smith I used just orderd a Bell and Carlson synthetic stock for me. They can be ordered for a long or short action Mauser 98. Cabella's and Bass Pro carries them and I'm sure any shooting supply house as well carry them. Good luck and Good shooting.