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I'm not 100% sure. What you just said does ring a bell!! I still have a couple of esp mechs aswell but I remember the crossover to SRAM. I think it was Sachs maybe that was bought???
Cool. Btw if u change yr title ('NOS/NIB 97 SRAM ESP 9.0 rear mech XTR equivalent' maybe?) you might get the interest this deserves - I was expecting something modern and only clicked cos I wondered why it was in the retro section.