That brace is definitely useless now. Its whole point to begin with is to be rigid, and it is definitely no longer rigid. How many shops service your Z? I'd go knocking on their door and make them pay for a new one + labor and take it somewhere else to install or just do it yourself.
This is why I'm glad I'm equipped to do all work myself; it seems a general rule that your average "mechanic" has an IQ no higher than 85.
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'10 PW 370Z 7AT - wife's car - Project Raspberry Cheesecake
'08 Evo X - built motor+trans | BB-X @ 32 psi | CH3OH | self-built+tuned - ??? WHP
'01 Galant V6 - built motor | GT35R | self-built+tuned - 550+ WHP (retired)
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