Mike, I'm familiar w/ the many offerings of Johnson. Have many collecting dust. Those pictured appear to be Babbitt lined bronze backed. NON resizable, meaning the Babbitt is very thin for strength. Babbitt is gentle on the crank jrnl. Those bearings are .002" under std size. the SB refers to the Babbitt overlay and code for brg construction. They're really not worth anything. Who has a perfect crank worn .002"? I'm tripping on them. David
