Originally Posted by
SB_Greg
Ok thought I had an understanding of this that any 8-10 speed Shimano derailleur with the appropriate capacity would work. Now I’m lost. Has to be a Dura Ace derailleur from the 90s?
It depends on which model these shifters are. Usually these aren't marked with "Dura-ace" or "Ultegra". Common ones are:
SL-BS77-Native for 9 sp w/most Shimano or 8 sp with RD-740x series. Using most Shimano RD with alternate cable routing as shown by Sheldon Brown is supposed to work. Never tried the alternate cable routing so don't know how reliably it indexes.
SL-BS64-Native for 8 sp with most Shimano RD. Standard cable attachment.