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Sorry for the slow reply - I didn't notice that you had replied to my message. I decided to sell the RTA-12bs as-is. I've got a pair of LSM703s on their way to me which I hope will be a good replacement.
I have four SL2000s stamped 1987. How much would you like to spend?
If you have SL2000 tweeters in good shape that you want to sell, I'm interested. I have some RTA-12s that have SL1000s in them. I bought the RDO194s, but I returned them after I found that they didn't fit as SL1000 replacements. I wouldn't mind hacking up some SL2000s to make them fit if I found some cheap.