Rather than trying to find B&S #9 end mills I would try to find some B&S #9 collets, then use straight shank end mills. There are several individual collets, and a couple sets for sale on eBay. several tooling supply houses also sell the collets as sets or on an individual basis. My US Machine Tools horizontal mill uses the same collets. I use the same straight shank end mills in my Bridgeport and the US Machine Tools mill