magnet

Hi Guys! Yesterday I bought a pair of used rb 81s(garage sale). They appear ok with only one problem; they have no tweeters. The cases were painted and no stickers on them. So I am looking for two tweeters for them. The problem is I don't even know what am I looking for. I belive tweeters start with K So I would be looking for K number. I really would appreciate any help. I really want to restore them. I know I can call klipsch but I want to check a few other places, maybe I will be lucky. Thanks again Magnet