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I should have also mentioned that I have also seen the center sleeve/spacer with and without the 20mm oring. The one without an oring may be a later version as it is very similar to the seal sleeve for the right hand crank bearing, it's just wider. As Karl said all the crank center shafts are 20mm. The spacer creates the OD for the 28mm seal and spaces the bearing properly. I have a handful of both type spacers that were damaged when I disassembled several cranks. Be careful when they are being taken apart. If you want to give me a ring anytime 619.675.4060, I'd be happy to answer anymore questions.paul