Im looking to do a chrome inner primary on my 2017 Street Bob. I already have the Wide Glide chrome outer primary on hand, so now I'm looking for the inner. Harley currently only has the 60792-06C available. I have the ability to get a 60792-06B on a good deal. Would anybody be able to tell me what the update was between the two inners?

Thanks for any info you can provide

 

I know going from 60792-06 to 60792-06B they added two dowels to line the inner to the transmission case but I believe from the B to the C they went with a different IPB but everyone replaces it with the high torque Baker bearing anyway.