There were two different bearings used in these boats. The traditional cutlass bearing has a brass shell surrounding and supporting the rubber bearing. Some early boats used a bearing whose supporting sleeve was a non metallic composite. The non metallic design is made for boats whose bearing is installed in a stainless steel strut to avoid galvanic corrosion
. This type has proven to be challenging to replace as they tend to disintegrate when you attempt to remove them.
Since none of these Catalinas were ever built with a stainless steel strut, there is no reason to use a bearing with a non metallic shell. Our brass shell bearing will replace a bearing of either design as long as the dimensions are the same. The brass shell has more inherent integrity making it easier to replace when the time comes.