RRB, you seem to be using the terms extractors/ejectors interchangeably. The mechanisms and the functions are different. My recollection is that BSS's are all ejector guns, and the Miroku and Daly (and maybe WesternField) versions came in both ejector and extractor versions. So, some of those parts may fit, but you have not told us exactly what is broken, so...? Depending upon what is broken, I would think about having the gun converted from ejector to extractor, if feasible. Extractor guns are simpler with fewer moving parts and less to break. Don't know if this can be done with a BSS, but I know it has been done to Parkers (including one of mine) and other doubles.
Midwest Gun Works in MO is a Browning shop and may have some advice for you. You might also go to GunBroker and do a search for Miroku or Daly; there is a gunsmith in AZ who is always advertising Miroku parts and repairs; if you can't find him, post back here and I'll dig out the contact info.
