Call Catalina
The Factory rep can give you very precise info on the bearing for your boat. It has to fit both the shaft and the strut.The boat, of course, needs to be hauled & you'll need to pull your prop. Replacing a cutlass bearing involves a "puller" to get the old one out, as well as a way of forcing the new one in. You may be able to borrow these tools from another boater or club in your area. Unless you are an experienced mechanic it might be a challenging job.Don't forget to re-cotterpin the prop & install a sacrificial zinc on the shaft before launching.--Ron