The problem is that Shimano decided to use the same molded part number early on and differentiate 7400 compatible bar end shifters and normal ones with a small silver sticker on the lever that says either "Compatible with Dura-Ace rear derailleur" or "Not compatible with Dura-Ace rear derailleur" the later 9sp shifters also have a sticker that states compatibility with 8sp 7400. I think the ones with black SIS/friction selectors tend to be normal 8sp but I'm not entirely sure.
Last edited by Kuromori; 06-03-19 at 03:04 AM.