Also I forgot to mention they can search the Nissan database and see what other Z's have had this issue and the mileage that it happened. That was another reason I was able to replace it as I remembered a forum member breaking his bushing at 18k miles so it reinforced the fact that it happens. Don't know if it will help you current situation but maybe going to another dealer will help out.
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"Punch"
Too much to list and a baby shot of nitrous....
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