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Z52 was available on an '87 convertible. Someone correct me if I'm wrong, but I don't believe Z51 has ever been available (to my and probably many others' disappointment) on a convertible...
1987, RPOZ51 available only in coupes with manual transmission. In 1987 RPOZ51 also included "structural enhancements designed for the convertible" whatever that means. Cross frame under the car? Maybe I should go look...