I recently replaced my chain, but was hoping my cassette was still good for a while. Unfortunately, I get significant skipping on the 14, 15, and 16 tooth cogs, so they are worn out. I could just replace the whole cassette, but that seems like a waste money when 70% of the cogs are just fine. I've looked online to see if I can buy individual cogs, and found a couple of places that sell Miche Shimano Middle Position cogs in the right sizes.
Does anyone know if these can be used as drop-in replacements for cogs on an Ultegra 6600 cassette?